TexasCHLforum.com

If you search eBay for "TL-15" and "TL-30" you can find real UL rated safes, not RSC "gun safes" for often very good prices. It may take awhile to find big enough, and close enough to your location, to suit you but they do appear. If you are in hurry this not a great option, but if you are willing to spend some time shopping, you may find a great deal.

Also take note of who is selling the safe, it's often a middleman who is buying them cheap off of someone who has to unload the safe (like a closing jewelry store) and he may offer other services like shipping (there are probably some in Dallas). He also may deal regularly in used safes, so if you can find one close enough to suit you, you can watch his offerings and/or let him know what you are looking for. I would have a good locksmith over the lockwork, which is not free, but again the whole package may not cost much more than a new gunsafe and it will be vastly more secure.

picclick.com is a good way to search ebay in a hurry -- just search on TL-30 or TL-15 and it brings up lots of pictures of safes for sale. It's usually easy to pick out the ones large enough to handle long guns. Unfortunately I can't find away to reliably search on location (e.g. "Texas" or "Dallas") so have to wade through ones that are way too far away, but if you have patience you can come across some interesting deals.