The only society I deal with is the wpcs, the Welsh Pony and Cob Society. They are much more transparent than they used to be, not to expensive to join and register, well, it's getting steeper because of the chipping and they're getting tighter and tighter with they're DNA records. Bit cliquey but I ve seen worse.
They've got a good webby which is always improving, including on line shop, including registrations, DNA tests, chips etc etc, new online records, minutes, sales and show reviews, stud lists, very good.