I know, it's a slow process buying anything on Ebay unless you want to put in crazy bids.
Unfortunately, to buy JC from a shop also means paying too much in my opinion. I've tried countless searches on the internet and drawn a bit of a blank on quality capes for a reasonable price.
You could try emailing the Glasgow Angling Centre to see if they could email you a photograph of the different quality capes they sell. I think the price ranges from around £25 to £50. However, I always like to select tying materials by hand to make sure I get what I am looking for.
I'm sure you've already tried it, but if you do a search for - "jungle cock" cape - on google and select the UK only box, you will find a few suppliers. However, they are not cheap and there is no guarantee of quality.
Like Juro said, Fishermans Feathers have a supply and I think they can be trusted on quality.
Personally, I wouldn't opt for the best capes for anything other than display flies.