Curently? Probably my Super Mario RPG cart with instruction booklet. Though I'm contemplating pawning my remaining SNES carts and manuals, and pocketing the 300 or so I'd make from them. Would go a long way.. At this point, my SNES is just a paper weight/display item in my gaming space, as I currently have the SNES classic with loads of roms on there (both for NES and SNES, bit of Genesis and GameBoy as well).

At one point I owned the NES cartridge of Bubble Bobble 2, but in my naivety and haste to get rid of it for a decent amount, I sold it on Amazon for like $80 when the average asking price at the time was like $350, and I believe is currently going for about $450. *smh* Ah well.. I've made probably thousands of dollars selling old games from my childhood and teen years so I guess at the end of the day it's small potatoes..

In 3rd place is my sealed copy of Super Mario 3D All-Stars going for $120. Twice the original MSRP.

My only regret is that I did not have the sense to buy a digital copy as well so I could play it on my Switch. Especially since I haven't played Mario Sunshine yet. I my friend's digital version thanks the the Virtual Game Cards feature, but didn't manage to beat the game before it reverted back to my friend.

I own Fragile Dreams for the Wii which goes for around $200 AUD these days on ebay, maybe if I hold onto that for a few decades I'll be able to fund my retirement.

Collectors have shown that they are willing to pay big dollars for even crap games if they are rare enough, but when you tie-in Earthbound's meteoric rise in popularity as one of, if not the best RPG on the SNES, well... you can see where it's coming from. Personally, I'd give that nod to Chrono Trigger, but Earthbound would be a close second. Definitely worth a play-through for any lover of 16-bit RPGs.

It seems I own quite a few. Some of the most valuable seem to be stuff like chrono trigger and castlevania dracula x for ~$250 each; CIB stuff like twilight princess (GC), Smash bros (64), Castlevania 3 (NES), Zelda minish cap for $150-$200; Conker's bad fur day, demon's crest, megaman X2 for ~$120; the gameboy player with disc for ~$130 and lots of other things I forget haha.

The good thing about my collection is that I bought most of it during the mid to late 2000's before retro collecting became "cool" so I paid $10-$30 for most things so even the most common stuff that now goes for $50-$60 would give me a profit.

The bad/sad thing about it is that I don't think I'll ever actually sell anything myself so by the time my kids or grandkids want to sell something most things probably won't even work 😅

Probably my copy of Chrono Trigger. I bought a copy from a friend of mine a few years back for like $80 or $90. It's now going for over $200.