I do not know of any sites specific to triline styles, but you can always try a keyword search at a distributor or foundry, like this. Another.

The 'Lined Font Identification Guide', by fellow Typophile Mike Yanega.:
> www.bowfinprintworks.com/LinedFontGuide01.html

Dav, formlos

Formlos, thank you. I found this site about a year ago and lost the address. This was the exact site I had in mind. Thanks!

Where has Mike been lately? I havent seen him in quite a while.