I would keep an eye in Ebay, you get some very good one-offs if you look often enough.
The best bait apron I've ever seen let alone owned came from Ebay and that too is a very well thought out, heavy duty pvc type with cotton backing which is especially useful on the inside of the bait pockets to stop maggots sweating and a very nice touch are curved bottomed, instead of rectangular, bait pockets so that there are no corners for things to crawl or fall into which makes them difficult to get out.
With all the right things in all the right places it's the best I've ever owned, it's just shame it's grey but I'm happy enough to overlook that little issue!
Sorry I can't be more specific but trust me they're out there of you check often enough and nab the new listings as they appear.