It looks like you are from Glasgow, GCC gives 20% off for members who have monthly membership. The latter DMM Protection set is 120 pounds, if I recall correctly.
Tiso/Cotswold will price match. You can get 15% off at Cotswolds and 10% off at Tiso with GCC membership card (Cotswold do not stack discounts while Tiso does apply 10% off at sale items, but I am not sure about their price matching policy).
Have the usual discounts at GCC/Tiso/Cotswold, but even with those, it doesn't seem like particularly great prices. The Rock + Run link has some great stuff on it tho. cheers!