PVC shelving cost more than 2x4x8'. Had I used 2x4x8s, my cost would have been under $20 for shelves to hold 7 tubs. Instead, PVC cost me just under $80. The cross couplings are expensive. Home Depot & Lowe's are approx $2.50 each. They did not have. Had to order from ACE. Seems the cross coupler is not in high demand, so price was $3.00 each. Recommend 2x4s on wheels.