I've bought seed several years from this site in England (shipping costs aren't very much). Had great results and lots of seedlings.

http://stores.ebay.com/choiceplants

I bought seedlings from this gal on eBay
http://www.ebay.com/itm/15-Hellebore-Lenten-Rose-seedlings-mix-Shade-Perennial-/180856258969?pt=LH_DefaultDomain_0amp;hash=item2a1bdf8199#ht_1395wt_1139

they are small but VERY strong little seedlings. I'm very happy with them

Sharon Cash
zone 7

Oh my goodness, the best seed purchase I ever made was from Pine Knot Farms in South Carolina. can't swear they are still doing this, but I had great success with PKF mixed open pollinated seeds. They were 50 seeds for 5 dollars, you cannot beat that! I got an incredible variety; solids, spotted, veined, doubles, anemones, almost black, whites, even 2 bright yellows. The ones I don't like so much and intend to cull....I have friends standing in line asking for them! The catch is that you need a lot of space to grow on 50 of the plants to see what they will look like. they also sell strictly southern Belle seeds, 5 for 5$. You don't need to spend that; get the 50 for 5 bucks! But hurry, their seed season is ending.

If you want to choose the type of flowers you get, then use Elizabeth Town in Tazmania. I have gotten seed from them 3 times and the plants are vigorous and 80% true. BUT, you have to wait until January to order from them.

Here is a link that might be useful: Pine Knot

I have never purchased Hellebore seeds from them but Plant Delights Nursery is a very well respected mail order nursery.