I discovered this product today: FastRack.
I currently use a bottle tree, and while it works pretty good, I'm always paranoid about contaminants getting inside the bottle from the tree.
The price ranges anywhere from $22.99 up to $33.99. The best price I could find online was at OntarioBeerKegs.com, at $22.99 so that's where I ordered it from. Their shipping was a few bucks more than another site, but the overall price was still less.
My only concern about the product is how well it works with swing-top bottles, which I have many of. I'll post my findings once it arrives.