There have been many Altair or IMSAI clone attempts, some successful in small runs. Altair 8800 Clone - Mike Douglas http://altairclone.com/details.htm Pricing was $621 as of July 2013 http://www.gizmag.com/altair-8800-clone/28136/ Altair Kit - Grant Stockly's project (~2007) http://www.altairkit.com