Just got in touch with a new CDC and she's charging £2.10 for bars and tetras, plus £2.50 delivery! I'm sure my old CDC used to charge a lot less than that and would do an offer if you brought so many.
My tetras and bars are £2 each, its the postcode lottery in effect. But totally happy to pay that, I feel I am definately getting my money's worth. Could you collect to save on delivery?