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PKP's website produces a slow itinerary which is Berlin-Lichtenberg to Kostrzyn nad Odra (NEB 5173), Kostrzyn to Krzyz Wielkopolski (REGIO 80426), and Kryz to Poznan (REGIO 87148). I have no idea how much it costs, but may be cheaper than 29 EURO. Then again, it could cost you more.
Best bet is exactly that - it's about 10 Euro (less if you can find some people going to Kostrzyn - people will approach you in Lichtenberg asking if you're going there - if so, it'll be about 6 Euro) to Kostrzyn, then about 25zl from Kostrzyn to Poznan. All in, about 15 Euro each way.
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