Stay away from pet stores. The easiest way to find a dog is here:
http://www.petfinder.com/
You can find a ton of dogs available from a local humane society or shelter. You'll know that it's healthy and up to date on it's shots. If you want, you can skip the puppy stage and find yourself a nice dog that's already housetrained and knows the basic commands. As far as what type of small dog to get, I have no clue. I'm not a fan of small dogs. I know money's not an issue for you, but if you find a nice dog at the humane society, it should cost less than $200. I got my last dog for $105.