the USTA (US Trotting Assoc) alongside trackmaster are posting free PP's for their Strategic Wagers (pick 4's with "respectable" (even to you tb guys) guaranteed pools)
click the link and scroll down a lil past halfway on the left to see the days list of Strategic Wagering. its everday and its free so check it out. and even if you're not into pick 4's its 4 free races of PP to browse for that easy $ on the side.
http://www.ustrotting.com/