Ti Roller ball set, $30. Puzzle blank, $40, Box $5. Glue up, wait time, turn time, finish time at LEAST 3 hours = 3 X $25. Shop materials and shipping(yes, you used them and they must be replaced) = $10.
Your investment in time and materials = A+B+C+D = $160.00. Knowing what to do with the raw materials should be worth 30% mark up = $48.
The lowest price I can see is $200. I'd ask at least $250. And that's assuming you have no overhead other than electricity.