Welcome to the RX bizkit!!
Check out the front page of the RX and from there you can click on the "bonus page" link, or just click on the various books on the left or right side of the page.
http://www.therx.com/
Not sure about contests (may be some baseball ones coming up), but there's plenty of good bonuses at some solid books
Journeyman is running a post up contest for bases and I think Bucsfan is doing his Team of the Week again this yer, which is also for a small postup
btw, the RX works with books for various free contests, but usually open for those with 100 or more posts