The $5 standalone was on their site yesterday morning with an "Out of stock" label. I suspect I wasn't the only person who was annoyed to see that listed next to the bundles, and they removed it because complaining.

I still bought a bundle, because I haven't found any other way to get this in the next few weeks, and the board plus a few basics will be a great <$10 white elephant gift (after I see if I want to keep it for myself).