Last time Groupon only offered compatible brush heads and they sold out.  Now you can have the real thing (they call Clarisonic the Cadillac of cleansing systems).  Three available Clarisonic options:

$105.99 for a Clarisonic Mia 2 cleansing system in blue or pink ($125 list)
$145.99 for a Clarisonic Aria cleansing system ($199 list)
$165.99 for a Clarisonic PLUS cleansing system ($225 list)