I highly doubt summit ever runs sales. I work for keystone automotive in PA and we match any price that a customer can find. Summit normally sells for about 3% over "jobber" which is normally what the store/garages get the part for. What a customer gets the part for is MSRP [manufactars suggested resale price] and if the store sells it for less than MSRP the company [such as edge which makes programmers for trucks] the company can refuse a warrenty.
...Yeah, I know it's a pain in the ass, but alot goes into it...Summit is one of the biggest competers.