$400 for new is not so bad. See if a dealer can order from GW and compare. If near Morehead City, NC try Rusty Ron’s Marine Surplus. Hit or miss GW surplus items but everything is new.
If handy you can make one yourself. You can get all the materials off Amazon and Fabric Warehouse. Do some searches here as there are some good threads on doing it yourself. If you have it made up it will cost a lot (BOAT).