Posted By:
MattChiSoxFan - unfortunately, their web page seems out of date with their policies (yet again). If you notice, they have an "Express" tier, which is a 10 day turnaround service, with no minimum number of cards and a $500 maximum, making the "1900-1947" tier (5 card minimum, 15 day turnaround, $250 maximum) obsolete.
They are also running a cross-over promotion this month, which states explicitly no minimum.
I have made pre-war submission to them in the past with only 1 or 2 cards at a tier, and it was never a problem.