Ive been looking for wakeboard racks for ages as i too am not willing to pay circa £200 for the monster ones or any of the other big name brands (there are at least 10 others)
The cheapest rack that I've found is this
but it requires a horizontal tube on your a-frame.
I have had a quote from this seller for $45 shipping for one set and $60 for 2 sets
If anybody wants to go halves on the carriage let me know and we can get together and buy a pair of racks and save some money.