These EVM (evaluation modules) are built and designed for testing by huge IC firms... just look around and...'um... sign up...hehe..if you can't get Eval boards get sample parts! OP AMPS and many other components are FREE from the original manufacturer. Some are "alternative" parts and the DIP are usually the cheapest. SMD and SOIC devices tend to NOT come in single qty unless you pay a few dollars.
Easy search tools are online for various OP AMP power requirements, form factor and output ratings. Low voltage power requirements are best for portable iPod versions, however 12v+ power with amps over 10W per channel are available for speaker applications. Build your own iPod boombox or dock with amp & speakers!
Most IC firms have free SAMPLES and/or discounts for quantities of ONE. They usually deal with THOUSANDS of parts on tape reels. It's expensive for them to send you ONE part.,so they built these "testbed" or sandbox modules for customer testing...all pre made and with easy pins for attachment to power and audio inputs/outputs! Search IC makers websites and get free samples! These are NOT for resale and are for testing only...;)
You usually get ONE only...but of each type! Order seperate parts or all together!
Also see tangents excellent DIY amps & improved designs from Chu Moy's/Sijoase. Buy his low cost pre-fab IC boards!
http://tangentsoft.net/audio/cmoy-tutorial/ he has some parts and parts #'s for most distributors
and see the headwize DIY forums for the bleeding edge stuff...! ya way cool.
Links to pictures of Sijoase's amps...was some talkway back of IC board production runs from Sijoase schematics...? hum?