Feel free to order your own from the NSRA at 6p/target then
Whilst more than doubling the price does seem to be excessive, either the club paid postage (paper is heavy), or a member has driven there and back.
And then I would expect the club to stuff a couple of pence profit on targets. So you're looking at:
6p+delivery+profit = 15p
Obviously you would have to ask your own committee what the delivery and profit components look like. If you were in Surrey I'd think it ridiculous. Peterlee - depends how they made their way from the NSRA to you, and at what cost.
EDIT: Huh, Didn't realise NSRA postage was included in the price. Wrangling a courier down to get targets at 4-6p/target incl. postage is impressive, and does make a 3-4x mark-up seem rather excessive, though it's hard to say without seeing the club's accounts.