Already checked that and the memory chips can be sourced for a reasonable price. Having said that, they will still not be original GVP modules, so the question is if one wants original RAM or just a RAM that works.
You don't, by chance, have a more direct link to the project, do you? I tried to find it from their main page and could not.
I have an accelerator (A1230) that has 8MB on it, but would love to max it out if it were at all reasonable to do. Whether it is purchasing from someone or through this project, but it seems from what I have read in doing some research that they are very expensive if you buy the old GVP ones, assuming you can find them.