OP writes - I got 10 8ft long 2x4's and two sheets of OSB at just under 1/2 inch thickness. The OSB sheets are 8 ft x 4 ft, so I just had the guys at HD rip them in half lengthwise and it gave me four pieces at 8 ft by 2 ft. I also bought a box of 2 inch wood screws, and it totaled $56 dollars. The only thing I didn't buy were the 2x4's for the middle and end supports, so if you have to by those this project would be just about $60! Not bad.
This is another area that doesn’t always need closed storage, especially if it’s a space dedicated to storage. Stock up on budget racks and store everything you don’t want to part with but don’t actually use. If you apply the Pareto principle, you probably use only 20 percent of your stuff. So that means you can store the other 80 percent.