sold/shipped by Amazon[amazon.com] has MOEN Folding Teak Wood Shower Seat, Wall-Mounted (DN7110) for $134.20 w/ Free Shipping. UpdateYMMV - I tried various zip codes in CA, it may not ship to all of CA
19 in. wide & 15 in deep; Overall width is a little over 20 in. & overall height is 16 in.
When seat is folded, it will stick out from the wall less than 3 in.