MyFonts is not yet authorized to sell this font directly. However, Linotype, Adobe and Arthur Baker offer the font for sale at MyFonts:

Amigo™

family of 1 font from Linotype, added in 2000

  |  available for Desktop, Web, App, Epub and Server

$26

Amigo™

family of 1 font from Adobe, added in 2007

  |  available for Desktop

$29

New Amigo

family of 6 fonts from Arthur Baker, added in 2008

  |  available for Desktop and Web

$12–$61.20