I'm a newb at Smarty, php, etc. but I managed to scrape by a "Shop by Price" mod. I could use someone who knows what they're doing to check the code out but it does work. Don't ask me how?
I'm a fast learner, I figure in the next 70 - 75 years I'll be good at it.
http://www.goldmisers.com/Shop%20by%20Price%20Mod.zip