White PIL's go for quite a bit as they are rare, I've been after one for some time but wouldn't be cheeky and offer you a pittance for the shells, which could easily have the innards from two standard gameboys stuck in them and sold on for a profit. I would recommend that you do just that, if you can find the time, sell the cartridges either separately or as a job lot and sell all the cases and hardware together on ebay as a 'gameboy modders starter set' or something.
I take it you're in the US as I can see a dollar sticker on one of the backs?
That is correct! Good eye.