In my area, a lot of LFS, and Mom & Pop stores were willing to take them in. I made sure to visit them beforehand to make sure they were in good hands, and that the fish stores knew their stuff. A majority of the LFS knew what they were doing, some not so much. Like one of the fish stores, on the call, they were nice, and seemed like a good place. They asked if any of the fish were sick, so on and so forth. However, when we actually went there, it was filthy, and there were dead fish in the tanks, and looked like they haven't had maintenance ina while. I guess it really depends on the hobbyist and/or Fish store receiving the fish.
As for your specific fish, as long as their peaceful, healthy, etc. they will most likely will be willing to take them in. The bettas with the cardinals together is a little iffy. The bettas might get territorial with the cardinals. Also, the cardinals might get nippy. I guess it depends on the personality, and even so, you might encounter problems.
I'm not sure about the fish stores in Phoenix, but mine were happy to take them in. I hope this helped in any way. 😀