Shurvend
I have the Shurvend half-pint front loader. I believe it holds 18 selections, and, for me, that is just about right.
I use one entire shelf for terry and microfiber towels, one shelf for trees, tire foam, armor all, and glass cleaner, and one shelf for various $1 wipes-- glass, armor all, blackjack, etc. In my market it's a good combination.
Everything I have in the vendor sells; however, I think I'd be hard pressed to put many more items in it so going to a 51 items vendor would be a bit much for me. Not to mention having to stock and inventory 51 separate items?