Installing this is simple--just wire it up exactly like the old one, using the new snubber capacitor to replace the old one. If you don't see a snubber capacitor attached to your power switch, just wire it across the AC terminals.
US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.