BoomerangTags.com are really nice...
Here's my shopping recommendation for the day:
I wanted some new tags for Chester that were easy to read and durable and this past Monday I ordered 2 from www.boomerangtags.com. I received them only 4 days later and I am very impressed with the quality of the tags. The engraving is deep, crisp and very easy to read and I really like the look of the 1" round beige plastic one. I also ordered a 1" round stainless steel one and it is also very well made. I've had tags from other sources including the do-it-yourself ones from PetSmart but none of them were as deeply and clearly engraved as these.
Chester likes the lightness and looks of the plastic one:
Here's a better view of the plastic tag (and El Senor Chestero's crazy cowlick!):
And here's the stainless steel one: