On Sun, 5 May 2013 15:23:28 -0700 (PDT), wrote:

Those things are like fifty bucks.

Yes, that's correct.

The OP's requirements are rather incomplete but an encapsulated supply
like this seems to be a reasonable swag for "industrial equipment."
This presumably means that Very Bad Things Can Happen if it fails.

A low cost answer would be something along the lines of a 555-driven
voltage inverter, a few filter caps, and 7805 & 7905 regulators, all
wired point-to-point on veroboard.

Absent any specific requirements, I suppose either would do.