Personally, I htink that the IIIA is about the best gun they ever made. Had a 1964 IIIA .380 for my first off duty gun when I became a cop in the '70s, never had a problem with it. Just got a 1996, the quality is definitely down, but on non-functional stuff, and it still feeds and shoots well. If you buy a LLama, it's best to try for 1975 or earlier. And after about 1985, it's really iffy - you might get a piece of junk, or a good gun. It's a gamble.
I just got a couple IIIA mags from someone on gunbroker.com. Just do a search for Llama, and go through the listings that come up, you'll find them. Triple K also makes some Llama mags, that's where I got some for my Model XIB 9mm. You can also find various caliber Llama mags at most gun shows, and .45, 9mm, and .380 Colt mags will work in some Llamas, mainly the earlier models that look just like a 1911. I don't know if they work in any of the Omni or Max models at all. About the only caliber Llama mag I've been unable to ever find is a 9mm Largo, but I've heard that the .38 Super and 9mm Largo mags are interchangeable, and I have found some .38 Super mags at gun shows.