Try DAM Watersports. They make a range of paddling gear, cags,
trousers and full suits in breathable & non-breathable. I got a dry
cag last year, twin-seal waist, neck and wrists for about £100, made
to measure and its definitely the driest, most robust cag I've owned
(have tried Nookie & Palm Extreme cags before).

7 Brampton Close
Bedford
MK42 0HD
Phone 01234 267314
FAX 08701 360701
e-mail

Nick