Clipper is free if you are willing to let them tie it to a credit card for auto-refills. The web site at least used to be a bit hard to navigate to do that, but you only have to do it once. After that it's dead easy to tag on/off Caltrain and BART or tag on to Muni (supposed to work on VTA and SamTrans but I've never tried.)
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Date: 2013-10-26 12:34 am (UTC)