I managed to pick up a qmotions set cheap. For me as a beginner it has improved my game more that then lessons i've previously had.

Spend an hour every night hitting and get instant feedback as to direction and swing speed. Along with a trial of swingmedic software i've eliminated the slice that has been a constant problem of mine.

Have had problems running the Tiger Woods software but the Qmotions support were excellent at providing solutions.

If you are in the UK, get down to TKMaxx and see if they have any in stock. Mine cost £50 from there, was originally £180.