In a studio installation, I use a 10' wooden dowel, 2" in diameter, with a screw eye in either end. I hang two pulley & rope setups, and feed them to one point on a side wall, attached to a clete. On the other end I use those fasteners that slide with a spring, to open temporarily and attach to the screw eyes on either end. Not only does this cost less than $25 in wood, hardware & rope, but you avoid having any addtional stands and such on the floor. You slide the roll of seamless onto the dowel, and attach it to the fastener, then pull up the ropes. You can hang other materials by clamping them ("A" clamps from the hardware store) to the dowel. We had three sets of such dowels in my last studio, and we could hang hair lights and props from the dowel as well. You will probably have to "A" clamp one edge of the paper roll to the dowel to keep it from unrolling.
When I go on location it gets even cheaper. I take a couple of light stands or "C" stands, and take an "A" clamp, and invert it like a "V" onto the top of the light stand. Then you lay the dowel between the two "V"s and raise the light stands to the height you want (with the roll of paper already on it, and unroll what you need). If you're worried about tipover you can put sandbags at the base. I like superclamps, but didn't neet them for this purpose.
We had two pairs of those aluminum pole things, and they lived in the corner of the studio for 12 years, never used.
Andy Pearlman Studio