Thats sort of high for fading. I bought mine for $350. It was in Excellent condition with no fading. It has sat on my porch for a year. We only used it about 5 times. L was almost too big and the girls would rather walk.
I really need to get mine cleaned up (no fading, just dirty) and list it on CL again and on Ebay. Not sure what I will sell mine for. I would like to get $300 for it since it is still in excellent condition because we barely used it.