Square 721 family (Bitstream library) contains 6 fonts. They are available in OpenType, TrueType and PostScript (Type 1) formats for PC and Mac.
You can buy and download them online. Click on the font picture to buy the font.
Square 721 - Webfont & Desktop font « MyFonts
Square 721 font family, 6 styles from $24.75 by Bitstream ... Choose your own sample text ▢ Webfont browser screenshots
http://www.myfonts.com/fonts/bitstream/square-721/
