I also purchased a Beck/Arnley coil from Advance auto a couple years ago (for my civic). I had no problems with it, but it's not of the same quality as oem and for the small difference in price (and since it's such an important part) you might as well go oem.

If you're real short on cash Partsgeek.com has some for very cheap, but not oem. Autopartsgiant might also have some for cheap.

Acuraautomotiveparts.org has the oem part for a good price, not sure about shipping.

I'm sure there's other places with similar or better prices if you look around or maybe even if you have a nice dealership nearby you can get a decent price on one there.