Were they Buco or Enduro?
I have restored two sets of Wixoms, which are similar to Buco in design and mounting and being no longer made:
A set of used Wixoms costs about $200, and restoring and painting them costs another $600.
New fiberglass Enduro repros are available from Luxormarine for $550.
I have seen good original ABS plastic Enduros go for several hundred $ more.
So I think you would be very fortunate to find a NOS set of either Bucos or Enduros for only $500.