Craghoppers does moderately priced ones. Fjallraven does expensive, but very Fjallraven-y ones. I haven’t used either in cag/anorak form, but I’m sure they’d be ok and in line with other stuff from either brand – ie: unflashy, but effective enough / very expensive and quite good. Google says Alpkit has one too, a ‘half-zip jacket’. Peter Storm too. It depends a little on your definition of ‘good quality’ too I guess.
I don’t really see the attraction of a cag tbh, jackets are far easier to put on and off and all you really save is the weight of half a zip, which is why they\re a little thin on the ground, particularly if you’re after and old skool, super long one.