Be sure to check with Yakima. At Canoecopia earlier this year one of their reps told me they still have a stock of Q-Clips which they will be selling off. Also, many shops which carry Yakima stuff have various Q-Clips. I checked my stock of used clips and I do not have Q57. Sorry.
Ridiculous price. I sure got the impression from the Yakima rep that they wanted to unload their remaining stock of Q-Clips and assumed that meant inexpensively. I will be going to a couple of bike shops that carry Yakima stuff and will check for you.