I do have Grade B but only dyed as the rules on natural colour don’t apply. They were cheaper than the prices you quote. My last two Grade A Natural capes were between £75-85 in UK. These were purchased directly from the vendors. One was at the Gamefair and one from a shop. The last purchase was two years ago. As one poster noted above you get what you pay for with JC.
To be clear, by Grade A I mean good sharp colouring (no fading), no splits and the majority of feathers in the smallish - large (the percentage can vary depending legitimately depending on whether you are mainly a trout or salmon tier) with a minimum of tiny pin or large flat heads. In my experience you won’t pay materially less for that in UK and I have seen then around £100. I have also seen some advertised as Super Grade A but I’m not sure of the providence of that term.
I’d be sceptical about buying one unseen unless it was from a known acquaintance or repeat business. As for on-line bargains, the camera may never lie, but the person showing you a picture of something different from what you will get might.
Regards
NHP