Look out for this thing for newer sellers PayPal and eBay have worked out- they can hold your money for up to 21 days after sale if you haven't been an active seller for more than 6 months or some gubbins like that
That's defy the best bet. eBay is quite biased against the seller now- I've only made £238 selling stuff on there and I was landed with a £25 fee from eBay out of the blue, and it wasn't from seller fees- eBay wasn't responding to my questions about the fee and I only paid them because the bank was threatening to cancel my card. I probably won't use the site again.
Try your local University Psychology Dept. They usually want test subjects and will pay for your time. Its a lot safer than medical trials. I recently signed up for a study which will involve testing me twice, once normally and then having not smoked for 12 hours. They pay £80 for that (Muahaha I knew smoking would pay off eventually)
I found some stuff to try and sell, lets hope someone wants it though
I think might excessive height might be the only thing they would be interested in testing on me Dont smoke, no drugs and very little alcohol - god im a boring person! Ill check them out though