I've bought a few things from field and trek online, think they're part of sports direct. Pretty cheap and quick delivery but the range of some stuff can be limited so depends what you're after!
I use Adidas Kandidas for trail running, haven't had them too long but they're comfy and a good fit. I over pronate too, I use Brook Adrenaline GTS's for road running.
I've run in various generations of Adrenaline GTS's for years and find them really comfy and a good level of support for my feet for both longer and shorter runs. The 12s are just as good as the 11s!