I highly recommend this place for authentic Buddy Belts. Also, if you do a google, you can find coupons for free shipping and at least 10% of the harness, and possibly more. Fast shipping too, my first one took over a month, this one came in less than a week with regular ground shipping.
Buddy Belt
Here's an example of some of the codes you can paste in, on your order.
Muttropolis Coupons & Muttropolis Promo Codes
I think if you sign up with them, and give them your email, you also get a coupon for so much off.