Cheap 4x5 lens source?

[Ty G]

A while back, I came across cheap (like $40) lenses with flanges. The had plastic elements. I think it was at surplus shed, but they no longer have them. So, is there a cheap lens that will cover 4x5 or a bit smaller that can be bought regularly? I am asking because a customer is wanting something economic for a stereo camera. And knowing a source would be great for me as well for future projects.

[Glenn Thoreson]

Do as I do. Watch the auction thingie with much dilligence. They're out there. All you have to do is watch closely and be patient.

[Toyon]

Apo-Gerogon 150/9 lenses are usually very cheap.

[Vick Vickery]

You can often pick up Ektar or Optar 135mm's and 127mm's on eBay for practically nothing, and the 150mm versions for not much more.

[domaz]

You can pick up Tessars on Ebay for cheaper than even Ektars or Optars usually.