If you’re considering a night splint to improve calf flexibility or help with plantar fasciitis, you can now get a pretty good one for a little over $30. It’s made by Futuro. I found it at the Porter Square CVS in Cambridge, MA.
It doesn’t grip you as aggressively as as more expensive ones you might get from a medical supply house, but it’s cheap, much more comfortable than most splints or the Sock, and a good way to see if a splint will help.
There are some nice Night Splints at that site. Good prices, fast shipping, I bought one myself.