Braun replacement toothbrush heads are so expensive - What compatible heads do you use?

[NightNite]

Just that really, the Braun heads seem to cost £3 to £6 for a single head in the supermarket.
There's got to be a decent non Braun alternative?

No other replacement heads seem to give the best clean so I buy x8 or more via Amazon at once but we have x4 toothbrushes in the household than need the same heads. Today x8 are £17 so £2.13 per head.

I just bought these for the same reason and they are ok. Different to the real ones but still work effectively.

https://www.amazon.co.uk/gp/aw/d/B07BTR5353?psc=1&ref=ppxpoppmobbbasin_title

I've been using the charcoal bristled recyclable ones from Amazon - they were something like £7 for 8. They're not the same, but perfectly usable.

Before that I had the real ones on subscribe and save from Amazon, which was cheaper than RRP, but nowhere near £7

Boots (online) do £10 Tuesdays and regularly have a pack of 4 oral B heads for £10. I get mine that way.

I ended up getting the 16 pack of these as it was less than £2 more than the 8 pack.
www.amazon.co.uk/Replacement-Toothbrush-Compatible-Rechargeable-Toothbrushes/dp/B07W136QBZ/ref=mp_s_a_1_3?crid=X40KWJPG18S8&keywords=yanaboo+replacement+toothbrush+heads&qid=1664977794&qu=eyJxc2MiOiIyLjg1IiwicXNhIjoiMi40MyIsInFzcCI6IjIuNDQifQ%3D%3D&sprefix=%2Caps%2C1478&sr=8-3

Thanks for the suggestions