There are a number of resources that I think are important. Here is a short run down of them.
SexSwings.com – SexSwing.com has pretty much everything you will ever need to know about using or installing a sex swing.
Screamer Swings – Screamer Sex Swings are the top of the line swings
Trinity Swings – The trinity swings are great for entry level swings
Fetish Swings – The Fetish swings are a lot of fun with several colors and styles available
Wild Side Novelties – The Wild Side is an affordable dual hook option
Whip Smart Swings – The Whip Smart is a very comfortable but narrow swing.