what makes the biggest mark up on ebay?

[NinaNannar]

for under a £5.
have an ebay challenge amongst mates.

if i knew the answer I'd be very very very rich

boden childrens?

some cheapy oilily babygro?

agree with Laurie
or Peppa pig stuff does well and lego

Postage on lego eats into the profits though.

Not sure if I understand the question though. The mark up depends on the price you got the item for, surely. So if you can source for free, you have an advantage over someone who pays £3 to source it.

Is £5 the likely selling price or the profit you are hoping to make?