Heirloom roses has them for $3

http://www.heirloomroses.com/merchandise/labels/customized-plant-tag-round.html

I'm not endorsing any of these places because I've never bought from any of them but in the back of the ARS magazine they list three tag makers.

www (dot) AAAQualityEngravers (dot) com

www (dot) harlane (dot) com

www (dot) KincaidGardens (dot) com

Petco...... Dog tags

Don't know how fancy a tag you prefer, but I like the Amekron aluminum tags. About 3" x .75". If you order direct, the minimum order is 500 & runs 11 cents each, but I've ordered them off of e-bay in boxes of 100 for ~.16 each, IIRC.
They "emboss" by writing on them with a pencil or pen. I've got perfectly legible ones 15 years old. Big enough to write lots of info on, pre-punched for wires. Nice utility tags.

I only need about 50 tags onto which they (or me) can add the rose's variety and maybe the date to rose was planted. It doesn't need to be too large -- less than 4" X 2").

The tags must be pre-punched so they can be tied (with a wire) to one of the rose canes -- I don't want a label that gets stuck into the soil.