That's where I bought mine, too - the website is
http://www.heirloomtomatoes.net/.
Chesapeake produced some of my largest tomatoes this year - several 1-lb plus.
I'm going to try Scarab again next year, since none of my seeds germinated.
And if somebody can help me locate seeds for a Hanover tomato (see my thred re: the Baltimore Sun article), I'd like to try that.