If we are talking about a run of 500 units at a factory gate cost of USD 80 to USD 100 I am prepared, in principle, to fund the manufacturing run and deal with the shipping to individual buyers.

A number of caveats:

1. I am probably not equipped to deal with the factory (depends where it is). Someone else would have to do that.
2. I would need to have a good number of units pre-ordered and pre-paid before going ahead.
3. I am not going to be able to offer returns/repairs/warranties, unless it's a manufacturing fault that affects all units. If all the units are faulty, then we can get the factory to compensate in some way. If just your unit gets fried by cosmic rays, then you're going to be out of luck.

If this is of interest, let me know, and we can work out some more details.

Regards

Mark