Yes, B. I think those clips are sold both as fishing rod clips or as tool clips for work benches, so either sporting goods that have an expansive inventory and not just shoes and shorts might have them, or wood-working or auto parts places might have them. Some persistent Googling will probably turn them up, or you could ask at a pipe shop where the owner actually installed the pipe wall himself.
I feel I should mention that both these styles are not particularly efficient for use of space. A standard open pipe rack with two levels of ten pipes each takes up a fraction of the space, and considering how pipes accumulate, that could become important.
