Frame Relay is not a service, it is an encapsulation type.
Frame Relay is an industry-standard, switched data link layer protocol that handles multiple virtual circuits using High-Level Data Link Control (HDLC) encapsulation between connected devices. In many cases, Frame Relay is more efficient than X.25, the protocol for which it is generally considered a replacement
You can have several different media that connect you to the internet, Frame Relay is but one of them.
While I can appriciate what it is that you are looking to do, a FR circuit is far beyond the price range of a gardener (and some successful small businesses!!!!!)
If you have your heart set on one, call your local phone company, get the number to their business services group, and ask them for pricing. On a most WAN links, there is a connection charge, and you are billed per byte.
To give you an idea, this company services greater Seattle, WA, US:
http://www.seanet.com/services/frame/
Frame relay itself, is quite fast, depending on what it is you plan to use it for.
Odds are, you will be far better off hosting your site with a hosting company. It will cost a fraction of the price of a FR circ.