Hey Cuz!
I dont think ud get anything substantial in local stores for $250.
The connector for connecting a GPU to laptop (asuming it exists and works well), would have to be ordered online anyways, no way ud find it in a random store. Then add price for the GPU... Even if u find a setup for $250 .. it would use so much power that waiting a couple of weeks for the usb dongle thingy from ASICMINER would still be cheaper.
No way is anybody gonna sell u FPGA @250. They seem to be selling out like hot cakes... maybe in a months time they get cheaper.