Wow, they'd have to be greenhouse grown, I'd think. I have friends in North Dakota and they are still getting frosts/freezes this spring (as recently as last weekend, in fact), everything is very backed up, growing-wise.
Justjoan, did you pick any up? How were they? For $1.98 a pound it might be worth a trip to get some, heirloom tomatoes would be a nice treat.