rescues and the paper. A rescue would be best obviously because you're helping an animal who needs it, but some rescues have policies about people getting animals as gifts to someone else. I suppose too many of them end up being returned because the recipient wasn't really ready or whatever.
We found our little mugsy pug (best dog ever) in the paper. She was priced at $250 and she was a four year old breeder. Trust me once we looked around the property and saw basically the puppy mill setup we still definitely felt like we were rescuing her. She was being kept outside in August and you just never do that to pugs because they overheat and have such respiratory problems.
Anyway either way I definitely recommend an adult dog. Pugs can be difficult to get past that housebreaking stage, but once you get to adult age they are the best non-barking, non mess making, wonderful perfect dogs ever. Our four year old black pug is literally a no effort dog. We've heard her bark 5 times since we've had her. We've cleaned up after her less than that. She gets along with everyone and everything. The only thing is you do have to get the often more expensive weight control food and watch the food intake because they are prone to obesity. But she's literally the sweetest easiest dog I've ever known. Hope you find a good one.