I am an amazon prime member and have been using that. If the part isn't cheaper its close enough that the free two day shipping makes up for it. The free shipping is very handy on small orders, like when I need one AN fitting. Returns are also 100% painless and usually don't involve shipping costs.

I also like that a lot of the pieces I order actually come from performance places I have never heard of. I ordered a bunch of fragola AN fittings off of amazon and got them from three different vendors that I had never heard of. I like to think that is helping the little guy in some way?