While, for some reason, it is extremely difficult ...

While, for some reason, it is extremely difficult to find on their website, there is a spot for custom making your own shelving -- purchase posts of selected length, and the number of shelves of selected depth and width you need. To me, superior to being forced to have only 4 or 5 shelf options. Good quality, shipped promptly. Wish I had found them sooner, but I'll keep the info "just in case" I need more. (Already placed an additional order based on quality of first one received!)