Not too retro, but I found a complete copy of Pokemon HeartGold at GameStop. Price was around $60 and I used a $25 off coupon to bring it down to $35. Now I have this and SoulSilver(NIB, found at Target on clearance for $25 a while ago). Not too shabby considering what they go for.
Pokemon HeartGold
Obviously not mint, but it's close enough for me and came with everything.