Just pick some cheap albums that others might enjoy, I don't really know what to consider "cheap", so I'll leave that up to you, possibly around £5 or less.
It's Rock Action by Mogwai for a penny (and the seller is certainly trustworthy, I've used them loads) there are also a couple of other offers of just over £2.
All offers are excluding p&p which is always £1.21.
Go! Go! Go!