Whether dealing with A&A, or Cope, there are some things to be aware of:
First, they aren't Amazon, Jeg's, or Summit, so the shipping fees can add up pretty quick. To this end, try to order everything you need in one shot.
2nd, both charge core charges for certain parts, and this isn't always readily apparent, so ask!
3rd, they aren't Amazon, Jeg's or Summit, so the order may take longer to reach you...plan accordingly.