Though it is an old thread, the following info may be useful for new visitors:
You may find A+ practice tests information from several practice test vendors at practicetests.info
A+ Essentials: http://www.practicetests.info/comptia/a+essentials-practice-test-220-801.htm
A+ Practical Applications: http://www.practicetests.info/comptia/a+practical-application-practice-test-220-802.htm
The website has practice tests information available from several test vendors including certexams.com, Boson, Transcender, MeasureUP, and simulationexams. Pricing information, and links to the product page are also given. Check it out.