These are on special from Yokohama, $230ea is an advertised price from Tempe as an example.
You might be able to get them cheaper from your local tyre shop or you might have to pay a little more to get them shipped in so price may depend on your location, but they are clearing them out, assuming due to build date. Expect them to be atleast 2 years old.
They arnt going to be as good as fresh but if your not competing on them they still might be useful as practice tyres or for your road/trackday car.
These are a pretty soft/grippy/stiff tyre, this is a performance tyre and has more grip then some of the cheaper semi slick tyres. It is not a commuting or comfort tyre
Retail would be somewhere in the low $300's depending where you get them from so savings is atleast 20% off which is rare for tyres let alone performance orientated ones.
Realistically this will only suit a low percentage of users, but a deal is a deal, you might know someone, mention it on your car club or whatever.
Aww.. damn.. where was this deal when I did my tyres a few months ago when I had to replace my AD07's? :(