I ordered mine from fitness1st.com. They have a package, with weights and clips, for $49.95, or you can order the bar, clips and weights separately. I ordered in pieceparts, because I had some weights at home that I could use, and also the package, for some reason, had two sets of 2.5 lb plates, which I didn't see the point in getting. Does your curl bar hold plates? If it does, and they have standard sized holes (as opposed to the olympic sized holes), then you can use them for the TroyLite.
I don't know if that bar can be bought in stores or not. There were a number of threads about the TroyLite back in the September timeframe. Someone may have said what stores carry them. If you do a search on TroyLite (or Troy Lite with the space), you should be able to get more information.
I'm really pleased with mine. My hands are small, and believe it or not, the smaller diameter of the bar actually allows me to lift heavier.
Good luck!