I have/had the same issue. There is someone in Arizona (I think) who has a Saroca and was willing to sell the sliding-seat rowing kit (sliding seat and frame, oars, mini dagger board). As I remember he wanted something like $500 for the full set up. He wasn't willing to sell everything except the oars, and it was going to cost over $300 to ship the oars to where I needed them in New England. If you're closer to Arizona or don't mind the cost I'll find his name and contact info and send to you. If you want, you can e-mail me direct: my name, all lower case, at yahoo.
If you are looking for rowing gear without the sliding seat, I'd suggest NRS (NRS - Kayaking Gear, Rafting Supplies and Boating Equipment
). I was looking at the Cataract Mini Mag oars they sell. They also have a variety of other rowing gear.