Their website rivals Harris' for being right up to late 90s standards, but I have been very happy buying from Lickton in Oak Park, Illinois. They have a much more limited line than Niagara, with little or no 'off brand' gear (most tools are Park for example) but their prices are competitive, and they say they price match. I gather they ship VERY fast and cheaply, but I have gone directly to the shop, where the counter staff has been extremely helpful, and as a noob I need all the help I can get!
www.lickbike.com