These people http://www.margnor-online.co.uk/ are fairly near me and I turn to them when all else fails. No idea what their interweb service is like though...
Hi I have used this company a few times and am very happy with both service and quality,Under a £1 for 10 of M5x12 mm,prob what you need for the bottle cage bolts,and that price is delivered!
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I can get most bolts, stainless or not, imperial, metric, button head, cap head.
I can also modify most bolts on the lathe for the strange diameter shifter / brake lever mounts etc.