So I started watching out for them, & pretty much every store is carrying them. Most are around $40. They come in various lengths & materials. The one I most wanted was from J. Crew Factory for $39, but I wasn't ready to pay that much, & within days it sold out in most sizes anyway.
For something so basic, I headed over to the online thrift store thredUP. I found dozens of them there, most very inexpensive. I chose two--the first one from Moda Intl. looked like it might be too tight or short; the second one is made of cotton, so that seemed good. I had a 10% off coupon, which made the prices even lower, but both were Final Sale, non-returnable.
I like most of those too. But I won't buy another one! :-)