I ordered something from acuraoemparts and oemacuraparts at the same time last week (both are online acura dealers). acuraoemparts came in quickly with everything packaged nicely and organized (I bought a bunch of tiny parts of stuff I broke).
oemacuraparts took longer to get to me, but I think it's because one of the items may have been special ordered. I bought the updated 2006 wiper blades from them (acuraoemparts doesn't have them).
I would buy from both places. If you're looking for accessories, you might want to try handa-accessories.com (another online acura dealer).