In reply to Dan Lane: Not sure if it is of any use but just a quick note to say that fully rated
stainless steel maillons are currently available on ebay direct from Welsh manufacturer Makefast
http://www.makefast.com/ (ebay username
make-fast) at stupidly low prices - cheaper than you can generally buy normal steel ones for.
The have 10x 6mm on a 'Buy it now or Best Offer' listing for £16.69 and but they were happy to accept £10 (£1 each), plus £2.70 postage.
The also have 10mm SS maillons which would be perfect for any lower-offs or high-use abseils, listed at £2.65 each +P&P but you might get away with offering around £2 each.
Anyway, keep up the good work.