Actually, I asked my guide this question last week, as I am trying to decide whether to add on now or wait. I wanted to do 2 55-point contracts. He told me that after 1/15 there will be NO contracts for under 100 points, regardless of the total amount of points purchased.

So according to him, no, you could not do 3-50 point contracts. You should call your quide and ask directly to be sure.