I have scoured the interwebs and cannot find any info on the limited leather headcover sets that are out there. 3 last year numbered to 500 (British Open, US Open, and Holiday) and one so far this year...but what is the story behind these and how do I find out when they come out and where do I order them? How many do they plan on releasing and when is the next one coming out? Would love to know about this more so I can collect them without paying eBay.