hey its not a ls1 but there is a complete chevy5.3 engine trans and all controls (pcm and fuse box) on Ebay for 1800 with 3 hrs left
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7951555682&category=33615&sspagename=WDVW
edit found a 2000 ls1 an auto trans for $3990 with a warrenty
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7952893555&category=33615
alot of the engines are going for $3 and $4k so if you have one local i would say thts a good price.