Cheapest low power/profile GPU for second monitor?

[Nosenuggets45]

I love using two monitors but it makes my card run in 3d mode, so I'd like to get a really cheap and low power GPU just to run my second monitor. Nothing more. Will this fix my problem with 3d mode and can I get something for around $30?

Also, how does that work with drivers? Do I go about drivers like normal or is there something special I have to do?