There's more to life then ebay (I'm told) and, now and then, i do venture outside and look for Poole Pottery at local antiques fairs.  I'm lucky in living not too far from what must be two of the biggest in the UK, one at the Newark Show Ground and one at the old RAF Swinderby airfield in Lincolnshire.  Both are well worth traveling to and are timed to fall within the same weeks of the year.  

For me eBay prices provide the bench mark for what I'm willing to pay elsewhere, but when I've been to fairs, I've usually come away with a few bits of Poole I'm pleased with.  And in fact I've got some of my favorite pots that way.  I guess there's nothing that's going to get you digging deep into your pockets more than holdings your dream pot in your hands. (did I just say that?)  Anyway, Swinderby is  more open air, I think with more items new to the market, and probably with better chances of nabbing a bargain.  Newark has its own outdoors areas too, but also some fairly top-end retail with more specialist stalls.  You'll need a full day for each of them, and get there early, as lots of stallholders start packing up by mid afternoon.  Also, if you can, take a friend who's strong enough to carry loads, or better still one one who has deep pockets.

Smaller fairs near me, that I also like going to, are held at Doncaster Racecourse, Wetherby Racecourse and Kedleston Hall near Derby.  A couple of hours is usually all you need for these ones