You've heard of "A penny for your thoughts"?   Actually, you are welcome to just drop us an email.  (But the web-store system won't let us list an item without a price!)
Have a favorite stone you would like to see in your PetroViewer?  Let's explore that together.  Prices will run between $40 and $75 for a completed thin section, depending on the nature of the minerals involved.  Send an email, telling us about your rock, including a picture or two, and we'll offer you a quote. 
As PetroViewers lack the high magnification of a laboratory scope, many fine grained minerals can appear quite unremarkable in a PetroViewer thin section.   If, in spite of the best of intentions, no presentable thin section results, all charges will be refunded.