That one could be tricky. You'll be able to get tickets but will probably have to pay over the odds for that as (a) it's Bayern - Werder (two of the biggest teams and a pretty big rivalry, (b) it's one of the first matches of the season...
I would recommend going for a non Bayern match
Hamburg - Dortmund, Hertha - Bremen - are both options in August (and both are probably more fun cities than Munich) or you could go for Dortmund Stuttgart which is also in August. Hertha are a pretty good bet to watch, massive top class stadium which never quite seems to sell out (at least when I've been there)
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