crittergarden--Here's some for starters:
www.thelilygarden.com
www.farawayflowers.com
www.bdlilies.com
www.lilynook.mb.ca/
www.perennialnursery.com
Others on this forum will add some more, but these are all excellent places to get bulbs from. You'll have many choices. All of these have on line catalogs to view and most send out paper catalogs once you buy from them. The best time to buy and plant. is spring and fall.