Note: This type of foam does fade or yellows when exposed to fluorescent light sources. This in no way diminishes nor compromises the useful life and/or energy absorbent properties of these cubes. It is merely a cosmetic issue inherent to this type of material and will occur regardless of the manufacturer.Foam cube pits do require maintenance. Foam cubes will compress and compact over time and need to be "fluffed" regularly. Fluffing means that all cubes should be removed from the pit, and the pit should be cleaned and debris removed before putting the cubes back in. Raw foam will break down over time and the pit will have to be replenished. Most customers will replace a small amount of cubes annually or bi-annually. 6" cubes are $1.12 each + freight. 8" cubes are $2.50 each + freight. These can ship in around 2 to 3 weeks of your order currently (from MI). Let us know the quantity or the size of the area you would like to fill (length, width and depth) and we can provide a delivered cost. To Request a delivered price, click on 'Ask a Question' below.