Train commuters in Princeton Junction are asking themselves how much a convenient parking space is worth to them.A privately funded study was reportedly conducted by a businessman interested in developing the area. The study looked at having a private company construct a parking garage or to have the government involved in the process.The study found commuters would need to pay about $210 per month for a parking space if a private company built a garage. If tax dollars were included, the cost could be about $100 per month.Commuters interested in the proposal can attend a meeting Saturday at the West Windsor Volunteer Fire Company at 1 p.m.