Amazon has this Engraved Pet ID Tag for $3.50 + Free Shipping! Choose from different shapes and colors. You can also get both sides engraved. Perfect for your pet and also for anyone that has a medical alert (ex. Diabetic, Anemic).
You can go here and add the item to your cart, check the “This is a gift” box, proceed to checkout and then be sure to input the Shape, Color AND Engraving Information in the Gift Message area. You can have up to 3 lines of text on each side and up to 16 characters per line.