I managed to pick up the second one for six quid because people are completely oblivious to the sheer genius of many GBA titles and assume that the carts are as worthless as tissue paper. It's a hell of a lot of fun, but I haven't played in ages. It seems like the sort of game that I would easily miss 60~70% of the actual playable game due to my non-Japanese tendencies to not search every nook and cranny.