craftgrrl | Help finding buckles

Hi this is a text only post but I promise pictures when finished! I need to get hold of some small,, cheapish (silver?) buckles to make fastenings around my upper arms as part of a costume. I found a site in the states but I need the costume in a fortnight time so postage would be a bit too tight (express postage too costly). Can anyone suggest somewhere to look in the UK? I don't live near enough to anyhere to pop in on the off-chance at the moment :(

4 of these in black would be perfect