We stock the Wahoo TICKR and Scosche Rhythm+ at discounted prices to OnBeat users. You can more than offset the subscription cost of OnBeat by retailing heart rate monitors at your location. You will also increase participation by allowing your users to immediately purchase a monitor onsite. Contact firstname.lastname@example.org for a quote.
You can purchase chest heart rate monitors with your logo for $22 USD per monitor with a 100 unit minimum purchase. You do not need an OnBeat subscription to purchase the custom monitors. The monitors are Bluetooth and ANT+ compatible meaning they work on other third party apps, as well as other group heart rate solutions. Retail them at whatever price you like, use them for marketing or package them with your memberships.