If you are lucky, you can follow the match on www.bundesliga.de
, every matchday they broadcast some matches.. now you can actually vote which match you want to hear !! the only problem is that its all german, but you can really feel the atmosphere..
If you really want to have English commentary, you will have to pay at the Bayern website.. the commentary is quite good, i believe its an Englishman who is talking so no german-english language
Btw, normally ZDF or ARD show the highlights of all the games at the end of the weekend.. still, dont know if you can all receive those channels.