We do the gold $1 coins as well. Our post office gives them out as change when you purchase stamps out of the machine (so you can usually get them at any hour of the day). I'm sure banks carry them as well.
We also have a note (I've saved it on the computer and tweak it for each tooth. Basically, it's from the tooth fairy and congratulates them, tells them they're doing a good job on keeping them clean (or reminds them then need to floss better, use their rinse more regularly in the evening, etc.) She also might note something about how quickly or how long it took for the tooth to come out, etc. And she reminds them that this tooth will be replaced by an adult tooth... something the'll have for the rest of their life and need to take very good care of.
Just a side note to think about... When my kids' friends started losing teeth, they all started "comparing notes." Most of them got a similar dollar amount, but we noticed that different families had different rituals. First of all, in most of these instances (Santa, Easter Bunny, Tooth Fairy, etc.) I admit to my kids that I've never seen or met them. Then I speculate options with them... maybe the Tooth Fairy is really a bunch of fairies, kind of like Tinkerbell has other fairy friends, and that whenever a bell rings, a fairy gets its wings. So maybe her friends have a different tooth fairy than we do. Just a thought before you start locking in your answers.
Good luck!
www.familyeguide.com Your guide to affordable family activities in Denton County.