As i’ve said before, ring your stores section at your parent station and ask them if they have some and what the cost would be. You’ll need to send them a cheque in the post or you can pay cash if you want to collect.
Some stores can be a bit arsey but I’ve yet to come across 1 that says no when you tell them its for cadets.
If you’re fortunate enough to have Halton as your parent unit, I know they are very cadet orientated and will definitely be able to help you out.