I've seen stock 512k boards for as low as $50 so for all the work of socketing the chips on a 128k board plus the cost of the sockets and new chips it's better just to buy the whole board. I've actually been thinking of just getting a 512k board and putting that in until I can find someone who knows how to solder who can replace the bad chip on the 128k board. I also didn't want to socket the chips because I intended to resell this if it didn't need a lot of expensive work to get it running and the value would be ruined with sockets added.