At the moment I think your best bet would be to interface to an ANT module if you would like to stay low cost.
I like using Octoparts to search multiple online distributors, I've
linked a search, Digikey and NuHo have stock on the 8-Ch module in tray in single unit size right now.
The kit gives you access to modules with connectors pre-attached, USB/serial interface boards, and some direct support over the phone/e-mail.
Cheers