Use code EV2020 for 30% off Aeropex, Aero, and Titanium headphones. Code not limited to 1 item and Aftershokz offers free shipping as well. Hell of a good deal. I picked up a pair of the Aeropex and saved $47.98 from the base price.
I personally recommend the Aeropex if you want the best sound quality and look, as well as the battery (can go a whole day)
If you're a swimmer go for the Xtrainerz (They don't have bluetooth functionality, but have a built in storage)
If you just want the best deal and the experience of bone conduction, grab the titaniums ($20 off normal price right now for 59.95)