This is the thing I've always hated about running shoes. I now try and buy 3 or 4 pairs if I really, really like one particular model (obviously it's a hefty output in one go though!)

The Mudclaw 275 was one of my recent favourites and these seem near impossible to get hold of for a "decent" price..I had 4 pairs at one point but they seem to break apart before 140 miles, which isn't great.

I did see the Mudclaw 300 Classic's on SportsShoes website though, think they're about £80 or so