5 for a CD is not enough, but I would expect a discount from the normal retail price when bought at a gig. In fact I only ever buy CD's at gigs. I would rather the Artist get the retailers profit & I get a discount (a couple of quid), then we are all happy. Although the best buy I got was a home made CD by Tony Wilson for £5, (he only had a couple left), with 20 odd songs on it.
Cheers
Les