Free things don’t come as often as they should, so don’t miss this free weekend preview of HBO and Cinemax on Verizon’s FiOS TV service. The free previews of the premium movie channels start Friday, Sept. 14 and end Monday, Sept. 17, 2012. On FiOS TV, you can find HBO’s HD channels from 899-913 (400-413 SD). Cinemax HD channels can be found from 920-931 (420-431 SD). Of course, the free previews include all high-definition versions of those channels as well. So, get your DVRs queued up to record some movies to watch later! Are you a DIRECTV subscriber? Good news. DIRECTV is offering the same free preview.