Tesco on Aston Lane have recently have recently started doing match day parking for £4. An easy out for those heading towards the A34 or M5/M6
Surely that's the wrong side of the ground for the M6 - am assuming you mean that way then up the A34 to the M6?
In terms of M6 access afterwards, I recommend the Power League as a good place to park. It's a bit of a walk, mind, and I am lazy so usually forego it for the convenience of the Asda car park.