Lawyers in Minnesota

I got charged with marijuana possession 152.027 subd 3 I would lose my job / apartment if I plead guilty. So I need to fight the case in court. I contacted some lawyers, from what it seems they say I could easily win the case, but the going rate is around $3000 which would put me many months back in bills to say the least. It's better then losing my job, but still.

Does anybody know a pro bono lawyer willing to take a case like this? Maybe someone in law school willing to take the case for me?

Thanks in advance for any help/suggestions