As cheap as possible. I know that the average "cheap game" can be bought for about $5 so I want to get much lower than than. Once I get some quotes for the tooling I will know more. I fully expect that the tooling will be very expensive and quite possible cost prohibitive so I do have a "back-up" plan that might work also.
Cheaper is better, but if you can't get a great deal, don't sacrifice the project. Even at $5, many of us would prefer to buy repros over destroying original stickers. Also, tracking down $5 games that still have cases and undamaged clips is a time-consuming pain in the butt and competition is increasing. I'd gladly pay to buy something in bulk.
Also, if possible, please consider jewel case compatibility. A lot of modern jewel case doors don't fit snugly on TG cases.