I understand that bike shops need to make a decent profit on what they sell to keep them going, but sometimes it does leave a bitter taste inn your mouth when you feel as through you are being charged a premium for needing something there and then and not shopping online. I was at a trail centre a while ago and needed a new set of brake pads and was changed £20 for one set! I could have got the same ones online for half the price, or a little more in a shop. From that experience I would be unlikely to look at buying anything from that shop.
Anyway, I didn’t get a puncture yesterday on the Dartmoor classic so didn’t need the tube!!