I take it your LHS likes to do the full retail sale thing on tires and doesn't give good service?
For tires, I have a place that will sell buggy tires for $8 a pair but there selection and menu navigation can be dated.
A good place I have used is rcboyz. They sell on ebay and have there own site at www.rcboyz.com
For a good LHS I dont' mind spending a bit extra as you get it back in service.