Another vote for cheap wireless chinese buds. I got these on the 3 for 5 section for 4.50 4 months ago and wear them daily at home, running and on the trainer (haven't ridden outside since..)
Sound is excellent, they never move. The worst thing is the case that is impossible to open without a tool for me
RYET 3D printed saddle also on cheapest I've seen it, 34€ right now from the official LEXON store