You can also check with local animal shelters or resues to see if they plan to do an event and will offer lower cost microchips. My vet charges $45 for the chip and $15 to register it. Winchester got chipped through a resue group for $7 and Lou Lou got chipped at a resue I volunteer at for $17. My local Humane Society just did an event where they offered them for $15. The tags that I ordered from boomarang are great and they were $7.99 a piece and are guarenteed for the life of the dog.