I thought I knew most of the basic concepts for biology, but I have never heard of dissecting fruit flies. That certainly makes you qualified on the coordination front. But I have to ask - I can understand removing a friut fly's brain, but what studies can you do based on that?

As for some of the other questions, those I can answer. The exact part number you should watch for is MT4LC4M16R6TG-5. I have already done a bulk purchase of the memory chips for folks on the board. See instructions in this thread. You might be able to get them from an electronics store, but I have not really seen them available. This was a bulk order from a parts locator company that specializes in buying remainders, etc. The memory is obsolete now (according to the datasheet on the Micron site), so you do not see it often except in older devices.