However, I do think there are ways to incentivized organ donation. You could be given slightly more priority if you need an organ over someone else of equal need. There's probably another way too that doesn't involve cash.

The government should have a monopoly on recovered organs, they should become government property immediately upon removal. Recovery should only be performed by approved surgeons and verified attached with verified records to back up the source to prevent black market organs from slipping into the network.

When you need an organ transplant, you should only be allowed to register for the closest metropolitan area. This prevents the wealthy from being able to hop a plane at a moments notice and receive an organ from anywhere in the country. Everyone is on the same playing field. Organs should only be transported out of that metropolitan area if there is a greater need for it elsewhere. Like if the #1 in Dallas needs a heart and there's one in Charlotte but the top few of the list aren't eligible for it, it should go to Dallas. Everyone on a donor registration should receive a ranking that's determined anonymously by a third party. Metro areas get first dibs on an organ recovered in that area before it must be sent elsewhere.