[Adriana]

Good answers, all and good question, Adriana. The problem is that once they are released - typically by a company, more recently by several - that is the end of our "control" of them and it then becomes up to the releasing company or companies to continue them - and perhaps for others to start carrying them as well. So far, Victory, Tatiana, Heritage Tomato Seeds, Sample Seed Shop - and increasingly perhaps, Southern Exposure Seed Exchange - seem to be the companies carrying the most, and Sandhill, Jeff Casey's company, Gleckler (when they were in business) and even Tomato Growers Supply carried at least one each.

. This is screaming for a spreadsheet of varieties and growers!