A standard food processor does a pretty good job too!

Hippie stores, nothing. Most Kroger brand, Kroger owned stores have them. Many Albertson's, and Winn Dixie's also have them (Kroger owned, but not branded stores)

That doesn't even include Meijer's or Costco which also have those machines pretty regularly.

Obviously, Whole Foods is gonna have them.

The sad part is that you'd do far better financially speaking in most cases (peanuts being kinda iffy here in the US specifically because peanuts are so damn cheap that it is frequently cheaper to just buy really expensive organic no-additive peanut butter,) by buying unroasted nuts, tossing them into a dry wok or a dry baking sheet, and roasting them. At that point you just need to throw the nuts into a food processor, and you get cheap, organic, nut-butter with absolutely no artificial preservatives or artificial additives. A tiny dash (1/4 tsp per cup of nut butter at most,) of normal table salt, and a tiny pinch (1/16 tsp per cup of nut butter,) of MSG will make your homemade nut-butter, "tastier," than any store bought nut-butter.

If you're grinding a low sugar nut such as almonds, walnuts, pine nuts, or macadamias, then you may want to add a tiny pinch (1/16 to 1/8 tsp depending on taste,) of your preferred sugar to the butter, but I would taste first before adding sugar. The salt is kinda necessary for proper tastebud activation for most foods, not just savory foods.