When considering which breakdown cover to choose, consider not only price for your chosen level of cover, but the size of the fleet, homecall options, roadside assistance limitations and whether there's priority response if you're in a vulnerable situation. If you've recently bought a new car you may find that it has it's own breakdown cover!
Get more than one quote if possible! Prices do vary, so shop around.
Ask your friends! Find out who they recommend and who they don't!
Compare quotes with your current policy - make sure you're getting a better deal.
Use the same insurer - you may get discounts if you already have a policy with them.
Increase your excess. A higher excess will mean lower premiums.
Pay for the cover that you need.