eBay £1.05
eBay £1.04
B&M Stores £3.99
(1m should be enough for the circumference of a caixa, hep or timba - you may need more for surdos or more elaborate patterns)
Happychrisji (China) £20.86 per 5m silicone tube
Chinly2012 (China) £17.24 per 5m silicone tube
Happychrisji (China) £18.04 per 5m silicone-coated