Fuel Stabilizer Recommendations?

[stupidamerican]

Hello out there - a little chilly these days.

Since owning my Fazer I've always used a Fuel Stabilizer over the winter months while not riding. Specifically I've used Stabil - but damn this stuff is expensive on Amazon.co.uk

I went to Halfords looking for something similar and found nothing.

Any suggestions on what to buy or where to look. It doesn't have to be Stabil but I would like to use a fuel stabilizer if possible.

Thanks
Clayton