I read about these on an email list and found them helpful.  There's a K-12 reading assessment (DORA) and math assessments at various levels (DOMA).  It's $20/per test.  Price was right for me.  We're homeschooling and I've taken over the teaching and wanted a snapshot of where DS is now and again where he'll be at the end of the school year.  
www.letsgolearn.com  And for all you data heads - your child can stop and resume the test at any time, and the scores are instantaneous.  I have no idea how accurate the results are as to the grade level, but I found it helpful, particularly for pointing out relative weaknesses.  I don't actually believe the high scores, but overall I think it was pretty good.  At least good enough for me and my purposes.  
