We have Home Again as they said that was the most popular in our area & most of the shelters and vets have a scanner for that.
And as for the price, I got an amazing deal when we were at the Husky Hike last year. I only paid $20 for both of the girls (my friend was involved with the fundraiser).

stacewase~I would call around if I were you to find out what the shelters and vets office (what type they have if any).