Ray & Pam,
I have been trying to locate a manufacturer & part number for you. The part numbers I have listed do not match the duplex receptacle in your picture.
If you look closely at your outlet, you should be able to get the Manufacturer (P&S, Leviton) & at least a style idenification (Acenti, Decora). Post what you see.
What the other's have said is true about using any device that physically fits from an electrical supply store (Home Depot, Loews, etc). It should be 120 volts (115, or 125) and 15amp or 20amp.
Gulfstream was using Wesco as their supplier
http://www.wescodirect.com/direct/Homepage.aspx though that may have changed. I don't think it matters though because you should be able to find what you need locally.