Try Ebay, I have just bought a really nice quality Middleburn lookalike 5 bolt MTB pattern middle ring for small money. They are becoming rare. I plan to go Hollowtech Compact next year for my MTB, they are so stiff and efficient and easy to fit.
I got one (a 110) from Chain Reaction... not a Middleburn, they didn't have one, an Azonic... but I returned it because it was too thick! Even on the shorter bb I had, the front mech wouldn't reach!
I've ended up getting a new front mech and chainset (from SJS) just to ensure compatibility; a little more of an expensive route but at least it works!
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