It doesn't seem, from the people I know, that many people are aware of the Breakdown repair cover, with The AA. You of course have to be a member with The AA in the first place, with basic breakdown cover, but with this gem added to your policy, the AA will pay up to £500 in repairs (minus £25.00 excess). This isn't just a way of selling something to you as I've used it. I drive a shabby Megane and a couple of months after purchasing it, the gearbox went. I called Renault and they quoted me almost £3000 for a new gearbox (thats on its own). I then went around and found a 2nd hand one. To cut a long story short, it cost me over £500 inc labour. The AA paid up. All they wanted was the invoice from the garage and proof the car had been serviced (proof in the form of a receipt). A few weeks later, they paid up. On the basis that they paid up, it paid for my membership 3 times over. Got my money back and more.
The Breakdown repair cover on top of my existing cover, cost me £84.00 (thats because mine is over 10 yrs old and over 100k mileage). It's normally a little cheaper. You can't get this as a stand alone policy - it has to be with breakdown cover.
On the AA site, you can get Roadside + national rescue + cover at home + parts and garage cover (breakdown repair cover) for around £158.00 approx