I've bought from both LMC and NPD depending on what I need.

Perhaps I go about it more methodically.. I set up a spreadsheet divided into phases of a rebuild (suspension, brakes, engine, exterior, interior, accessories) listing the parts I need or want. Then I enter heading columns on the right with the sources (NPD, LMC, DC, JBG, MAC, etc) and fill in their prices. Doing so lets me instantly compare prices and the total potential shipping costs. I mean, I only wanna pay shipping once to maximize the "bang for my bucks".

Sometimes it's a wash and sometimes not.