S.Peelman on 27 December 2014
I have DuckTales 2 complete on NES, Kula World on PS1, the Zelda Collector's Edition on GameCube and an (Pal) Australian Ocarina of Time gold version complete. Plus a bunch of old obscure PC/Mac games. Those are rare, but not very valuable. DT2 and OoT Pal gold version are besides being fairly rare also fairly valuable but not in any obscene amount.
Zelda games in general I've noticed are quite valuable, not because they're rare, but because there is a high demand. Especially the older ones on NES and SNES. I have them all complete, including maps and extra booklets, and I could sell them for a nice amount of money. My NES Zelda is apparently a rarer version that has two Seals of Quality on the box as well so I got lucky there.
