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Try to order boards from https://item.taobao.com/item.htm?spm=a312a.7700824.w4023-16080569721.11.6e5efbbasB39iB&id=532630623264
They almost like MDBT42 ut may be cheaper.
Honestly I don't know how they manage that - because just the bare Raytac bluetooth module costs me ~$4, without anything else.
I did contact Minewtech about a very slightly custom beacon (not even using a custom PCB) before I launched Puck.js and I was quoted around $15 at 1000-off I believe, for an nRF51 beacon.
I think it's just the sheer quantity they make them in.