I tracked down the Russian Queen to a Canadian supplier of heirlooms, but of course it's out of stock. This time of year, nearly everything is: they're still drying and cleaning the season's new seed. I'll keep checking and order in the fall rather than wait till planting time.
Haven't collected much seed myself. My third-genreration Bananalegs (favourite low acid yellow) let me down and I served the last Cherokee Purple in expectation that there would be more. The San Marzano (my new favourite sauce tomato) is still producing, so I should have a couple of nice ones for seed. Still have several varieties from last year, so I'm all set to tackle next year's blood, sweat and tears.