This varies greatly. For instance, I am doing some research with the Physics department (I enjoy Physics a lot as well), I am there as the Chemistry and Instrumental guy (and in fact, I recently redesigned the whole research experiment for better results). Anyway, the stuff I am doing there, as far as chemicals, we spent ~$150 a year ago and are still using the same chemicals.
On the other side, I am also doing research at another institution and it is a Biochemistry project. Pretty much every day I use anywhere from $800 to $1,500 a day on just chemicals (proteins and substrates, etc). That is how much we spend, and we have to get a lot of other stuff through calibration because we can not afford it.
Those are just two ends of the spectrum, it totally depends on what your research is.