Tracking down "Turk's Cap" lillies

I put in some lillies a couple of years ago, and this year, when they bloomed, absolutely fell in love with the recurved-petal victorian look of the turk's cap-type lily - they fit so well with the 1850s house (okay, so I suspect they're more a late victorian flower, but who's to care?). I have some Martagon and Citronella types, but I'm having a hard time finding others, since I don't know what names to look for, nor who sells them. What other lilies have that look? Any suggestions on names or catalogs? Are they all hardy to zone 4? Do you have favorites?

Thanks so much!
-Laura

Try here: http://www.oldhousegardens.com/index.asp

Hope this link works, first time I tried one. This has all kind of old plants. Only looked at site, never ordered.

LimeyLisa Kay

Oh wow! What a great site! Dangerous to the wallet, though...

Thanks - that is a great help.

Check out the coop at http://davesgarden.com/t/391920/ and I found a few other sources to consider.
http://www.dutchbulbs.com/catalog/y32468.1.html
http://www.bdlilies.com/
http://www.onlinebp.biz/flowerbulbs/
http://fogbeltgrowers.com/

isaberg & LimeyLisa. OHG is great! Prices may be a bit high, but I was very pleased with their bulbs and especially their customer service. Am waiting anxiously for my fall shipment.