Ken, you also have to take into account that the Slo-V is VERY new on the market, and that parts support hasn't caught up to the plane. It's perfectly normal for ANY new product; the company has lots of money invested, and they want to start seeing some returns as soon as possible. To wait for the parts inventories to be in place would be quite costly.

If you could extract the servo from the plane and post a picture of it, we might be able to turn you on to a suitable replacement. For example, Hobbyzone planes use "generic" GWS servos.