I am looking for an inexpensive microscope to determine
chromosome numbers in some hops I am breeding.

This one is an ok price: "Seben stereo laboratory microscope SBX-5"
http://tinyurl.com/324lyo ..scroll down to see details if it's sold.

Will I be able see chromosomes during mitosis with it?

I am quite new to this and know I will have to learn about
microscope techniques, chemical treatments and staining.