First - what is SR2? It is a form that the insurance company sends, for the driver, to the DMV (Department of Motor Vehicles). That means that the high risk driver has enough money (that is car insurance) to pay for the damages resulted in a potential damage caused by him. However, one cannot find inexpensive SR22 insurance because being for high risk drivers, it is thus more expensive. But thanks to the competitive insurance market, you can actually find a cheap convenient insurance.
What is an SR22 insurance document? It is a document that shows the fact that you have the minimum car insurance required by the state you live in; you also need this form if you driver's license is revoked. So, to find a cheap insurance for your car, there are three steps.
The first one is getting in touch with your insurance provider, who will tell you if you have the minimum insurance required by the state, thus they will give you an SR22 form. Be sure to ask how much such a form costs and, in addition, if there are informal documents that prove the fact that you have insurance.
The second step is getting in touch with local traffic school. Those approved by DMV are also able to give you the SR22 form if you show them your insurance. In order to find such traffic school, just browse the phone book or the Internet and ask them about the price of such a form. After several calls, compare the prices and choose the best one that suits you.
In the end, all you have to do is compare, again, the prices from your insurance provider and those from the local traffic schools you contacted. That way, you will be able to find a cheap, convenient rate in order to have the SR22 insurance documents.