All of the above, great advise...
A wanted add on the Stovebolt Page (this page) worked for me.
May I suggest you decide on exactly what years and sizes of trucks you will consider. The important things are year, mostly depending on if you like vent windows or not, "5 window cab" or not, and what ton rating, 1/2, 3/4, 1, 1.5, or 2. Also decide on Chevy or GMC. Note what engine you want, or if you plan to build one note that a good non running truck is preferred, even engine missing.
Post a wanted add with all the info, and what other models or differences you would accept as a second choice of price, condition, and location are right.
I found just the truck I was looking for, 48, 6400, no rust, no bed, no transmission, bad rear axle, and at price much less than I can buy a junk rust bucket around here. Still saved money and lots of time even with the trip from Virginia to South Dakota and back to fetch the truck.
Find the most rust free truck you can, and don't worry about location so much. A little, or even a lot of money up front for the right truck will save bundles down the road if you can avoid rust repair.
Grigg