I have my midarm in a 12x14" bedroom, and since all my children are gone I have another spare room it is also 12x14 and it has a full and twin size beds in it. I just lean the batting in a corner of that room. place the roll on the full size bed to measure and cut the batting for the quilts.
.I only buy 2 kinds of batting..Quilter's Dream Poly Select and Hobbs 80/20. in queen size roll. Shipping is 5 to 10 days so I usually wait until I am down to 3 yards of each before ordering.