P.M.
I wouldn't give something for the classroom but something that maybe the teacher has mentioned that she enjoys. My daycare provider belongs to a book club so I'm getting her a gift certificate to a bookstore.
If you're crafty or like to bake maybe a small trinket from your daughter or some baked goods show thoughtfulness.
I used to be a teacher and gift cert. were always great-even to a gas station if you know what to get. We al drive and "free" gas would be nice. I'ld give soemthing that I would like to receive.
As far as the amount you spend it really depends on what you can afford. And it's really not the amount that counts but the thoughtfullness that goes into it the gift. I'ld also write a note in the card expressing your thankfulness for what they do. Being a teacher(especially a day care provider) can be very stressful and a lot of times parents take us for granted, so make sure you let the teacher know you appreciate them.