I'm also planning a trip to Native Seeds Search, although for me that's more of a fifteen minute walk. Haven't yet made it, though.

I buy my seeds from a variety of places -- I've had decent luck with regular Ferry & Morse packs purchased at Ace. I've also gotten seeds from Hirt's Gardens (they also sell live plants), and, via eBay, Grocoseeds, spookyshorty (who mainly does peppers, which I've had little luck with, which seems to be a common story this year), and a seller in Singapore who provided seeds for Extra Dwarf Bok Choi that's been insanely successful.

Here is a link that might be useful: Hirt's Gardens

Cool! Thank you so much for the tips! (I did finally find Sugar Snap Peas at Mesquite Valley Growers.)