I made a trek out to Super Potato in Nagoya the other day. I love Super Potato even though I don't buy a lot there, its just such a beautiful shop to stroll around in and gawk at the amazing stuff they have. If I ever opened a game shop, I don't think I would do anything differently from what Super Potato has done with theirs.
I brought my camera along and in addition to the obligatory pictures of rows of Famicom games on shelves:
Battle Formula: 128,000 Yen
Over Horizon: 49,800 Yen
Gimmick!: 69,800 Yen
Adventure Island IV: 49,800 Yen
Metal Storm: 29,800 Yen
Also visible in the foreground is an oddity - the Gradius Archimendes version, which was limited to 4000 copies given out to consumers of ramen back in the day. They want 59,800 Yen for it, which is in the ballpark, but its odd because the box is a regular Gradius box. The Archimendes version has a distinctive label across the upper right corner which is missing on that one (otherwise it would be much more expensive).
Right next to them is the most expensive thing in the store, though I think it is a pricing error. A CIB copy of Recca Summer Carnival 92 for 778,000 Yen (that is about $7,000 US). That is definitely a valuable and rare game, but CIB copies usually go for about 100,000 Yen on Yahoo Auctions (and in fact there is one there now at that price). Super Potato's price tend towards the high side, but not THAT much, so I think this must be a mistake and maybe somebody accidentally added an extra zero to the price tag.
The cart only selection is also pretty impressive. Tailor Made by Bridgestone (49,800 Yen, the one with the cyclists on it) is one of the holy grails of Famicom collecting. It was distributed only to bicycle shops and allowed customers to choose custom parts for their bicycles, thus making it one of the rarest games out there (though also one of the boringest). Recca Summer Carnival 92 is available for the same price and is a lot more well known, though it seems to be a lot easier to find.
One of the more surprising things I noticed was actually that, impressive as this selection is, its nowhere near as awe-inspiring as it once was. A few years ago a trip to Super Potato would inevitably turn up some hyper rarities - like my visit to the Osaka branch a few years ago where I found copies of the gold Rockman 4 (only 8 ever made) and the gold Binary Land (only about 200). The hyper-rarities like those ones seem to have disappeared from the market as they never turn up on Yahoo Auctions anymore either. Games like Tailor Made and Recca are certainly impressive, but they don't really feel up to the task of headlining a Super Potato glass case.