Depending on what club you run with, SCCA PDX, PCA, BMW or AUDI CC, fees can vary. from 200ish for one day to 370ish for two day events. As far as which group to run with, i've run with Scca during one of their PDX's and NASA's HPDE. PDX is a really good entry in to driving on a road course. NASA educates the driver more and works on a tiered system allowed you to do more on the track the higher you go. For me i'll do PDX's for seat time but HPDE's to learn more.