I just picked up one of these on sale at the Grand opening of Jax in Lafayette:
Usually $90 - they have it as a grand opening special - today only - for $50. Looks like it will fit in one of my bay drop bags perfectly. Not a true drybox, but it has a foam gasket.
They also have a plastic / composite Army drybox made for missiles(!) for I think $45. I almost got one of those on principle; but it won't fit into my configuration. Might be a good inexpensive option for someone who doesn't quite have the scratch for an aluminum box. My first drybox was a surplus radio drybox that worked for years.
Thought I'd pass those along.