Final Fantasy Tactics Advanced 2 is probably dirt cheap now and will last you forever. I've put in a couple hundred hours on just one playthrough, and I've done several different playthroughs of the game to try out different team combos.
Golden Sun Dark Dawn is about $20 last I checked.
Age of Empires is another game that lasted me several hundred hours and was one of my favorite DS games for a long time. If you can find a copy, I can't imagine it going for more than $8 seeing as how old it is.
Chrono Trigger. Nothing else needs to be mentioned there.
Final Fantasy III (and IV, although I've never played it) are also good choices if you don't mind dated story progression (again, can't speak for IV).
Those are my suggestions. They're all pretty old games so they should be pretty cheap by now, and most of them will net you plenty of gametime too, so they'll be well worth the money.
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