As a preschool teacher, in Olathe, for the last 8 years, I have been appreciated in a wide variety of ways. I work in a 9 month preschool, where students attend for very few hours a week. In my case, 5 hs a week is all I see students.
My favorite gift to recieve from parents is a group gift. The flower idea shared by others is always a favorite. I think that cost about 1.50 a student.
I also have a book from one group of students where they were each sent home a questionaire page about me/their experiences in my room. They attached a personal photo from home on each of them. This same group, also had me a birthstone braclet made which featured each kiddos birthstone. One of the mom's was a jewelry maker, so I am unsure of the overall cost of it.
There are times that everyone pitches in 5 dollars and gives on larger gift, which is nice. It can be handy to have a nice dinner after a day when the students are in rare form and you've used up your energy in being patient with them!
I would say on average, a parent spends 5 dollars on an appreciation gift. My favorite individual gift is a nice picture/card and a small gift card to a fast food or department store.
I think since you are feeling funds are tight and you havent been their long a card would definately suffice.
Please remember that our profession is, by rule, highly underpaid. While you may pay quite a high tution, you would be surprised at how little of it actually reaches the teacher. If it is more a daycare, and less a preschool, I would assume your teacher only makes around $10 an hour. She probably has a to do a lot of preptime unpaid so that the environment can be stimulating for you child. She probably goes home and worries about the children/situations in her classroom. She supplies endless patience and guidance, sometimes amid chaos. While she selected this as her job, it is a field with a high turnover. Burnout is very common. Spending a little extra cash to keep good people in the field is worth it in my opinion.
One poster said that they would have to pay an extra 50 to 80 a month and I just can't see how that could be. My son also now attends preschool and so I am paying out the other end and I would say that I have spent an extra 60 all year on snack and gifts.