$19 for a Bike Maintenance Online Course from e-Careers

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这个deal看着不错。

https://www.groupon.com/deals/e-careers-1200

$19 for a Bike Maintenance Online Course from e-Careers ($588 Value)

The Deal
$19 for an online bicycle maintenance course ($588 value)
Compatibility: Windows (Flash Player required)
Course completion certificate included
Click here to view a video introduction to the course
Students enjoy one year of access to a library of online lessons on keeping a bike in working order. The 25+ units cover topics from brake repair to wheel truing, and each is taught by an instructors with at least 15 years in the field. Technical support is offered 24 hours a day Monday–Friday via email, phone, or online chat.