Dragon Models now has a website. It is still under development but already it includes a full price list.
For the GC modeller Dragon provide a very good single bolster wagon in 7mm scale but also a range of wagon transfers including the GC, LDEC and CLC.
The 'small' GC lettering is too large to fit bolster wagons. Strangely, what you need for this purpose is 'small' lettering in 4mm scale. The small lettering is OK for certain ballast wagons in 7mm scale, although if you want to be accurate you will need to scratch build the actual wagons. (Or you can cheat and use modified Slaters Midland 3 plankers.)