After you've looked up what you're interested in:
Total up the price of the stuff you want plus the shipping, then send me money via Paypal. My recipient address is firstname.lastname@example.org. Be sure to list the items you want, and your address. Then sit back and wait, generally two weeks more or less.
If you can't, won't, are morally opposed, are technically unable, or are just too lazy to do the very brief and easy Paypal thing, you can also mail me a paper check in U.S. funds. I'll wait three days for it to clear your bank before proceeding.