The other day, Penny was spayed. While at the vet, I asked how much a microchip would cost me. I was quoted a crazy high price. I'm used to paying no more than $18 for microchips and I've paid as low as $10 including registration before. So, I started researching local shelters and vets to find the best price. One shelter offered two brands 24PetWatch and Home Again. 24PW was $15 and HA was $35. So now I'm thinking, what's the difference? Most shelters and local vets I am familiar with only offer the 24PW chip (all of my animals have this brand). Is there something different that the other more pricey brands do? Why do they cost so much compared to 24PW? Is 24PW not a good brand? What is your experience or preferred microchip brand?