After making her purchase, she excitedly showed it to me and told me "It only cost $35!" My response was simply "...really?" I had no doubt that it worked quite well after trying it out for myself, but I thought it was ridiculous to charge that much for one. I promptly told her I could make one for $10.
I was so, so wrong. It actually only cost me $4.
Step 1: Materials
1/2" PVC pipe (2 ft) You can purchase either a full 10ft section or a precut section. I went with the precut section because 1) I am lazy and 2) it was only $1
3/4" PVC Couplers (x10) That is not a typo. You need 3/4" couplers so that they slide freely over the 1/2" shaft. Home Depot sells "Contractor Packs" of 10 for $2.
3/4" to 1/2" Reducing Tee (x2) Make sure to get the one with the 3/4" ends at the top of the T and the 1/2" at the bottom so that the bottom end connects to the shaft to make a handle. Should cost $0.50 apiece.
Optional: 3/4" Caps (x4) If you want to make your roller look fancier/cost more, you can buy 4 of these for about $0.80 a piece. Considering the cost of the project as a whole, I don't think they are worth it/necessary since it is only an aesthetic improvement.
Hacksaw/PVC Pipe Cutter
Rubber Mallet for Optional Improvement #1
Plastic Spray Paint for Optional Improvement #2