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GT85 chain lube - great stuff, but usually £3.99 a go.
I just went to Halfords, Redhill and bought three 400ml cans at the bargain price of just 65 pence each!
They have a promotion going where each bit of cycle kit gets you £2 of the price of a can of GT85, and another (no-longer-advertised) promotion going where you get three cans for the price of two.
In my case this meant getting one can for free (cost down to £7.98), and getting two pounds off each of my three cans (cost down to £1.98)! Bargain!
Don't forget you have to buy three bits of kit to get the £2 off - probably the three cheapeast things you can find in the shop.