All of them AFAIK. Even the Zero W can (finally) be had with relative ease, I just ordered one from SparkFun and Adafruit also has 'em in stock. Been wanting to make one into a security camera but they have been hard to get until just recently.
If you buy more than one, it is over $10 each and increases based on quantity.
Of course, I am lured in every time I am near and have a few Ws, and definitely spend more than $5.