What is a steel TR-3 hardtop worth? Mallard gave me one a couple of years ago. I think as friends we traded TR-3 parts for TR-3 parts. Thanks Mallard. So it probably cost me nothing. I had to have it painted ($500.), then I bought a new back window and had to have it installed ($250.), Then to install it on my car, I needed the mounting hardware from TRF ($200.), not including my labor I figure that I have $1,000. invested in my hardtop. Is it worth it? Yes, it transformed my car into a TR-3GT, it stands out among other nice TR-3s, changes the look of the car. Very neat accessory for any TR-3. The price of used hardtops is determined by how bad you want one. The key to buying one is the brackets and mounting hardware. My best guess is $250. to $500. for a steel hardtop, later original fiberglass hardtops $100 to $300. Good Luck, Bill C. Mesa, Az.