Hi kcasey16,
If you opt to go pop-up topper, I highly recommend AT Overland. They are made in Arizona and have dealers in CO, UT, and NM among other places. I just bought mine (a wedge Summit) from the dealer in Bend, OR. Dealers sometimes have used stock, so it would be worth looking at the individual dealer websites or giving them a call to see what inventory they may have on hand.
I'm really impressed and enjoying mine so far. Everything has trade-offs, but one advantage to putting a pop-up topper on a smaller bed is that you have the full extent of the pick-up bed for storage, gear, moving around as opposed to a slide-in that takes up some of the floor space especially in front of and behind the wheel wells.
Best of luck in your search!
Paula