I hate suggesting this because it probably would ensure I wouldn't end up with one...
But, I have seen giveaways like this done by the membership voting on the best submission describing the proposed use for the item being given away.
For things of minimal value that works - a Raspberry Pi kit, a DMM, or a Soldering station. But I worry that with a $$$$ item, the crowd will hound the person out of town unless the winner's hobby project delivers to their satisfaction - and you can't please everybody all the time. Some will want build logs, and to get "their money's worth" to see that it is being used properly.
Is somebody who spends his or her spare time attempting to build an atomic force microscope from a piezo disks and a DVD laser assembly any less worthy than somebody who services transceivers for a living? Is an old hand who already has a bench of kit more worthy than a novice who is just starting out?
If somebody wins it, then sells it straight away then I can't fault them for that. It happens all the time with spot prizes at cycling events... you find them on sale the following day, as the winner already has a bike that they love and the prize provides minimal utility to them.
What really matters is the happiness of the person who wins - if they are chuffed then that is the best you can wish for! If it becomes a burden for them, then the giveaway has been done wrong.