Emma has a chip, and Milli will be getting one at the next animal rescue league event. Emma got hers there for $15, and didn't even cry. She was more interested in the treat they gave her as distraction

Our vet charges $50 to do it

, so we won't be doing it there!
At Emma's vet checkup, I had them scan her to make sure it was working, and sure enough, they got a reading from it. They also registered her chip number to be associated with their clinic, so that if Emma was ever found somewhere, she could be returned to our vet clinic if we couldn't be reached.
You might want to have your pets' chips checked out too, just to be sure they're working-couldn't hurt!