Yes, there are dwarfing rootstocks for peaches. One I've heard of is called 'Pumisele

As a backyard orchardist I have had excellent results with trees from the big box stores. But let the buyer beware. It is a little like ordering from gurney or fields, who also do not grow their own plants, except you can see the trees ahead of time. I would trust the nursery lable more than walmarts tags.

I have never bought a tree from Walmart, but have bought so many mis-labeled plants over the years that I just won't buy anything unless it's blooming. I have had mis-labeled roses, peonies, water lilies, you name it..I just don't trust them. Donna

I bought a citrus tree at lowes a few years back. The lowes label said it was a meiwa kumquat. The nursery label said it was a calamondin, and what it turned out to be was a nagami kumquat. Just goes to show that you don't ever know what they are, although when it comes to citrus, you can sometimes get a ballpark idea, based on thorns, leaf shape, size, color, and petioles or the lack thereof.

Cummins Nursery has 26 varieties of dwarf peaches for 2011 shipping. They are using Krymsk 1 rootstock. You can preorder now and save.

Here is what Steve Cummins wrote to me: "These are going onto a new dwarfing rootstock called VVA-1 or Krymsk 1. This is a very cold hardy rugged rootstock that is 50% of standard. We will be planting them 5 ft apart in our orchard."

Here is a link that might be useful: Cummins Nursery