SILCONE WIRE FOR USE OF..

[Ross]

Found  18 AWG silicone wire which may be of use £8.85 for 5m red and 5m black. incl postage.  UK firm.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=390366790223

Seems a reasonable price.

[QuadBod]

34p a meter from GiantShark - so £3.40 for 10m, plus £2.76 postage = £6.16.

To which you can add more stuff. (Which may or may not be a good thing :-)