Marilyn, I don't think I've ever seen borage plants for sale... but Caroline is right, they grow very easily from seed.
A few years ago I had a couple of borage plants growing in my veg garden and they became infested with some pretty ugly looking caterpillars.... sprayed them with BT and was quite pleased with myself for saving the plants, until I realized the caterpillars were baby Painted Lady butterflies
(ever since then I've been a lot more diligent about finding out what the bugs on my plants actually are!)