Id say the Panesian titles. I was thinking about SE, but its been "alot" of auctions with it lately. Still pricey tho.

as far as cost wise stadium events overall is the game that averaged out over years has brought the most. at times it has sold for 8 to 900 dollars loose.recently the price has been 500 or over

the myriad has been selling for a lot lately but has sold for under 300 dollars a lot until recently

caltron has been going for 250 and under lately in the past it has sold for close to 4 to 500 dollars.

cheetahmen 2 a few years ago went for under 200 dollars many times

Prices all depend on whos wanting the game at the time or who has the money to spend at the time..in 6 months those serious about grabbing one of the rarer carts have already bought the cart  the price will come down.

The pananesians had come way down in price until recently.

all the games listed above are rare and dont come up often but there are a good many games that dont sell for close to what these games do but hardly ever show up

Chubby cherub box is very very rare ,Dain won the last one(outbid me
and one hasnt shown up since.Ive seen at least 5 to 10 of the games listed above compared to chubby cherub box.

sqoon box is another that you may see once or twice a year

other boxes that are hard to find
treasure master
challenge of the dragon
menace beach
sword master
james bond jr
little samson
bonks adventure
best of the best
pro sports hockey

race america instruction manual is almost no existant took me forever to track it down.

as far as carts there are a few that dont show up a lot but enough there not to rare
menace beach
secret scout
sunday funday
sqoon
pro sports hockey
waynes world
wacky races

i have been looking for just a cowboy kid manual for over a year so it never shows up by itself

but everything i posted isnt taking all the BINs that may have been sold

plus a lot of times something very rare doesn't always fetch a ton of money.  Most people don't know how hard it is to find a Cherub CIB or a Sqoon CIB.  Take Dain's licensed asian version Mahjong, that game wasn't even known to exist until he bought it off ebay a few months back.  It is ungodly rare, but most people wouldn't offer him more than 20 bucks for it, when it is probably actually worth several hundred cause it is the only known copy to exist.  I have looked all over the place for info on it, and I can't find a damn thing.  I still think you should just give me Mahjong Dain, you don't need it   Huge Insect is the same way really.  It doesn't bring very high prices and by actually rarity, it is one of the rarest games around.  Less than 100 copies (around 75ish) exist, and it rarely sales for over 100 bucks.  Rarity is determined by what people pay.  SE and the Panesians really aren't that rare to bring so much money, they have just been over emphasized.  If you look on egay, one of them is pretty much always on.  Like wrldstrman said, how many CIB Sqoon's are on ebay each year, 2-3.  There are at least 20 Panesians that change hands each year.

It was produced in pretty low numbers for one, and only had one production run.  Most of the early NES games had several production runs, so the likely hood of finding a box was increased.  Same reason the DK Math box is so hard to find. 

People always count Cheetahmen II, so why not Huge Insect.  Not like it is a pirate game or anything.  CMII wasn't released or sold either until the NOS of it was found and the sold off slowly.  I count the Sachens as part of a US becuse some of them were indeed sold in the US.  I remember seeing Honey Peach, Poker III and one other title at a local rental store here in Knoxville when I was little.  They were on the top shelf for adults though.  So if those title made it over in the late 80's early 90's it stands to reason that a few of the others did as well.  IMO you can't count CMII as a set if you don't count Huge Insect.

True enough man.  I just like to include Sachen games cause I have them all and think they are pretty cool. 

The reason why games like SE, the Panesians, etc are so expensive is because new collectors are still reference Mike Etler's list as the de-facto standard. For obvious reasons, the list is great, but extremely outdated. If a new list were to surface (ahem, NGD), and received wide acceptance, then people would soon realize the truly rare games and begin bidding them up.

So, as it stands, now is a really good time to acquire any of the rare games that aren't on Etler's list. Once the cat is out of the bag, prices are going to rise for lesser-known titles.

As for rare boxes, there's one other box that I think trumps most boxes: Family Fun Fitness Athletic World. I got mine from Qixmaster here a few months back, but that one is much rarer than Chubby Cherub and Sqoon combined. I've only seen 2 ever for sale on ebay over the last 6-7 years.

-Dain