Here are some links to the major suppliers, in the UK and beyond:
www.leonpaul.com/ – Fantastic range, value and reliability
www.allstar-fencing.co.uk/ Similar to Leon Paul, quality merchandise
http://www.pbt-uk.com/ big supplier. similar to first two.
www.duellistfencing.com/ Currently undergoing a change in management and a stock overhaul, so there are some big savings on stuff like lamés especially. (a sabre lame for £50!) however, stock size is severely limited and they are limited to sizes as well.
www.bladesbrand.com kinda cheap
www.swordpricefighters.com The cheapest by far, but don’t expect high quality or for it to last very long.
ebay- sometimes good stuff does appear, but be weary of quality.
further afield:
www.fencewithfun.com/ good german manufacturer, outstanding quality and cheap FIE blades- postage from continent
An interesting website I found today is http://www.fencing.ca/coaching_manuals/ Here, amongst other manuals, is a comprehensive armoury guide that should cover any questions relating to repair.