Is there any electronics stores close by?
I would suggest the Fred Meyer store on Sterling Highway in Soldotna. If you find something that is not in stock they can order it for you.
If you are in Soldotna for a longer period of time Amazon can ship electronics to you fairly quickly if you know what you want.
All you want just a short drive into Anchorage. All the majors are there. TooTall mentioned that Fred Meyer has electronics as does Radio Shack.
Soldotna is a full service town. We prefer Fred Meyers over Wal-Mart but you could also find a few small specialty electronic stores in the area. Keep in mind, Soldotna, Kenai, and Sterling are all in the same general area.