I depends on what I need. If it's supplies I go to the LCS because its right there and usually the same as online when you take into account gas and shipping. I buy a few packs too just for sh!ts and giggles and maybe make a big score on a low purchase (you know you have to). For boxes though I usually go online unless the LCS can get within 10 bucks of the online sellers, then im cool with it.
My LCS is cool and discounts me because I give him base Dodgers and Angels and once in a while a lowball auto so they keep giving me god deals.
You gotta grease the wheels a little ya know.