My understanding is that Glock will not ship a frame by itself, but will fit one to an existing slide assembly for $88.
You send the slide assembly, and a copy of your dealer's FFL, to Smyrna, they send the slide and frame back to your local dealer.
I haven't done this myself so it's only hear-say at this time, but lots of folks report having done it to get a frame to go with their .22 conversions. I just sold off the upper and magazines from a Glock model 22 and kept the frame for this same purpose.