I know this has been proposed before, but i think its an awesome idea, a lot of other sites do it, so why not make the best site that much better!
0.99-20
21-40
41-60
61-80
81-120
120+
Accually you can. Go to the left side where it says yoyos and click on that and a new sub topics will pop down. beginner, intermediate, advanced. Just click advanced and then when that pops up you can adjust the search settimgs in the middle of the page by price, ascending or descending.
I had never noticed that before. The more you know, I guess. 
However I do think an easier option could be implemented into the store. It would be a handy feature.