Something like this

https://www.noelleeming.co.nz/shop/audio/portable-audio/headphones/marley-em-jh101-bk-rebel-bluetooth-on-ear-headphones-black/prod147010.html

My 4yo has some Moki bluetooth jobbies which work really well and cost only $60

http://www.jbhifi.co.nz/portable/mp3-players/head-phones/moki/exo-double-black-bluetooth-sku-326924/

Sound is actually pretty good, battery life well outlasts whatever device it is paired with, hers are the pink kids ones whihc also have option to plug in 3.5mm cord and use as corded headphones

kmart had some $40 or $45 ones. No idea how good they were since I have already too many pairs of BT headphones and my bose are now my go-to ones for when I am doing gardening.

I use cheap aliexpress ones, behind the head, and cheap enough i don't care if they get rained on, sweated on (when running).  About $30

Thanks guys for the input. I have got some sorted. Moki from THW. $60. Surprisingly good.