Prices are still on the N64 games in that photo... 490y for Mario Golf, 590y for Banjo Kazooie and 690y for Kirby. Around $20 AUD all up! I'd guess the same games, PAL versions would cost at least 150AUD in this condition.
Tiny Toons was a bit of a fluke win for just 765y posted. Most Konami games from that era start at around 5000y in a box. Which is a real pita, because 2 of the games from my childhood collection that i want to get back are the Castlevania games. Dracula XX/Vampire's kiss goes for around 20000yIt was one of the last SNES games i bought as a child before selling the entire collection to fund a PS1. A mint PAL version these days would be worth a stack!
Kup's right in general, i still see plenty of dirtied and yellowed carts but most labels, manuals and boxes are well kept. Generally my area isn't like Akihabara or Den Den Town with lively retro stores though. I have one large place near me but they don't get a lot of new old stuff, and i have a recycle shop (not just games) which is where most of my luck happens!