For parts never bought from Aztec but generally will buy from Mouser or Newark/Element 14.
Sparkfun is one of those places that will easily over charge you if you are not careful. Also always read the comments of their products. I find a lot of people end up pointing out deficiencies in their design which often leads them to coming out with a new version of their product somewhere down the line.
Not bad mouthing them, it's just the way it is.