Of course you all aware that there is no easy way to search currently for all the models that are a certain distance from a given zipcode. But actually, there is a easy work around for the time being. Here is a screen shot that gives the primary details:
Essentially you put the state your interested in, and then put the first two digits of the zipcode are that you are interested in. Since I was doing my sample search for the DFW area in Texas, I used 76 for the zipcode. If you put the first 3 digits of the zipcode, then you'll narrow the results even more.
The search shown will show all the models in Texas who have a zipcode that contains 76. The 76 can be anywhere in the zipcode, however, so you'll always have a few that are misses. But this helps you to narrow down the search quite a bit. By the way, if you don't put the state, then you'll get a number of results from other states, so be sure to put the state in.