What is the best/worst you've done when selling at a swap meet?

Not really car related, but last week I picked up 2 kayaks at a garage sale (sundolphin journey ss)

Paid 100 bucks for the pair

A few days later I had to at the project house, which has access to a private lake, so I took the kids, and loaded up those kayaks

Got em in the water and hated them
I've been in kayaks before and never had any that were more nervous or unstable then these

So when I got him, I posted them on Craigslist for 250 (knowing full well whoever comes to buy them is going to want to haggle on em)

2 days later I sold them for 150

So, I got to use them for a weekend and made 50 bucks, though that was pretty good