barfly ones off ebay are pretty inexpensive ~$12-13 shipped. better quality then out-in-front mount included with the joule from powertap. good luck. My YouTube channel- https://www.youtube.com/ksquaredcycling Time RXR Super Record | Cipollini Bond Campgnolo EPS | Specialized Shiv TT SWorks Super Record | Colnago C59 SR-EPS | Colnago EPS Super Record | Colnago Prestige Ui2