I just received a couple pair of 6 mm neoprene booties from Divers Supply HQ, Macon, GA, for $20 /pr. Made in
Taiwan of course, but look reasonable, Velcro to keep zipper up, thinnish though grippy looking soles. Probably wear out about the time they get really stinky. Off to try 'em out, high teens breeze, 80 degrees and sunny, oh boy!!!