Wanting to replace a Makita 3/8" Collet that I had lost, I found this site after referring to Makita UK. All of the parts are genuine Makita parts and part numbers. The cost was very reasonable.
The 3/8" collet was £3.99 ($5.46) including taxes
The 1/4" collet was £8.99 ($12.31) including taxes
If any of our USA cousins are considering possibly buying these, I would be happy order them on their behalf and post them at cost.
My two genuine Makita collets delivered, amounted to £16.97 total including postage. ($23.23) Then you would have to add whatever it would cost to mail them to the USA.