Hi! There are 8 S-100 Serial IO board, 10 S-100 8088 CPU board, and 6 S-100 backplane PCBs remaining in case anyone is looking. They are $20 each plus $3 shipping in the US and $6 elsewhere. Please send a PayPal to LYNCHAJ at YAHOO.COM and I will send your PCBs right away! Thanks and have a nice day! Andrew Lynch