If you join the PSA Collector's Club ($189/year with 15 "free" grades), you can grade in bulk on the monthly submission with prices around $6/card plus return shipping. Then you could send in the stars on the 15 "free" sub and send in at least 25/50 on a bulk submission.
I just sent in 135 on this month's special; should have mailed them before New Years for $5.50 each. ;-)
http://www.psacard.com/SMRPriceGuide...?SMRSetID=1152
To me, they'd need to guarantee to be NM and even better for me to send in commons for this set. At PSA 8 (NM-MT, basically two corner dings and within 65/35 centering), you'd really make out best.