Boy, I think that will be a tough one to provide any valid input. While there are a few "kit" manufacturers out there, mostly in China now I suppose, but I think few of them are going to be able to provide kits at a price point that a small local retail shop will be able to import, mark-up to a profitable level and still manage to sell in enough volume to make it work.
Stirling Kit, Rocking Whale and the like might be worth looking into, but it will be a tough row to hoe!
Jensen still offers the model #76 as a kit, I believe, but again the price point would make it hard to profit from a retail re-sale!?!?