Yeah they don't it's a sound choice as most of them are still well under original retail, even the decent to good stuff like the notable franchise games on DS. Outside of a few weird outliers plus maybe the POkemon games (only now because of the Pokemon Go effect hitting all eras of it) they're good buys. Same can be said for loose Gameboy (any) and Game Gear games too if you like to have small space eating solid games that don't cost you a kidney donation to get stuff.
I haven't been down to that mall in a couple of weeks so I should go peek and see if something rotated in there. I only slowly got back into DS this spring as I had this mega pick at an out of town neighborhood garage sale in this rich set of homes. They had tables of stuff out and for around $40 I got a red 3ds xl in a great case with 5 games (1 3DS NSMB2, 3 were DS CIB and 1 CB) along with also mario kart for gc and a few GBA titles too. I remembered how much I enjoyed some Ds stuff and some I never got around so I have been measured about it but cherry pick a few things here and there I like and they're all cheap. The worst was $20 for PSZero and I think $15-20 for Chrono Trigger. I ended up snapping up Metal Slug 7(fun), Trace Memory, Hotel Dusk, Clubhouse Games, DQH Rocket Slime, Custom Robo, both metroid games, SMB, Zelda(Phantom Hourglass), Lionel Trains(awful looking clone of Railroad Tycoon 1), and Orcs & Elves so far. Between the highs and lows I'd say in at around $10/avg on them which is awesome.
I could say the same for Game Gear games I've picked up since April/May this year too loose and that one only has 2 high priced US releases (Mega Man $80-100) and Urban Strike ($50+) loose, everything else is like $1-20, mostly on the 10 and under level if you want something fun to experiment with.
It's kind of sad but for all the groaning I see on here about MVS prices going up, coming off my distaste of the damage done to NES/SNES/N64 cart games price wise they come off seeming reasonable if not cheap.
