I picked up a used safe for 50 bucks. It will cofortablely hold 6 pistols. As for the humidity problem you will just need to keep them oiled a bit more in damper climates. Buy some of those dehumidification bag thingies and change them out on a regular bases and you'll be fine. I'd check the "For Sale" adds in your local paper or even run a "Want Add". You just never know what might pop up for the right price.