Heres the price list off the top of my head:
Extra set of Lexus GS300 2003 housings. $200 + 25ship on ebay (optional but I got because I didnt want to cut into original stock housings)
Entire headlight set from 2004 BMW M3 included TWO of bi-xenon projectors, m3 headlight housings, ignitors, ballasts, all wiring harnesses. $300+25ship on ebay
Screws, bolts, silicon sealant, epoxy, and other bits about $30
Total spent on project so far is around $580.
Thanks flufferious, at least one other person with a GS has some interest in my retrofit
Some of you may say that the stock HID option was $500 and much less work and has auto leveling. All good points, but the stock HID is not bi-xenon and has a fuzzy cutoff line compared to projectors. :D
Anyways, I'll finish up the other housing sometime this week and have the guide posted up by the weekend.