I am trying to think of items that could be bought online for €12 or €35 - that would then be easy to sell on privately (for cash) - quickly and with minimum % loss.

Been racking my brains - but can't find anything to fit the bill. Does anyone have any ideas?

plenty of stuffs you can buy and sell it privately. Question is, what kind of stuffs you wanna sell?

Beats by dre headphones. Made quite a bit reselling them last year.

Anything on:

Code:

craigslist.org

or

If you've got a good eye or a smartphone you can try a goodwill store.