Quoted:
While many places have some things cheaper than Brownells, I've found almost everything I need in stock from them and saved money by only paying shipping from one supplier.  I do get an LE discount from them which also helps.  That said, I have found small parts to be much cheaper from other sources but again, it is very hard to find one single place that consistently has the lowest prices on the many things you may need as a builder. The other important consideration in ordering the stuff you need is the cost of shipping. While I might find a couple of items cheaper at one place, I may order it at a higher price with other stuff coming from a place with cheaper shipping.