I came across this company which are selling counter weights for the Osmo 3 and at a great price of just $9.95

https://www.ulanzi.com/collections/phone-gimbal-accessories-1/products/pt-10-dji-counterweight

Hello and good day DAFlys. Thank you for sharing this link and these information with us today. This link will be a very big help to all our DJI members who has the DJI Osmo Mobile 3 and are looking for a counterweight accessory for the said gimbal. Nice find and thank you for your support.

excellent find, just bought it, thank you!

Thanks for finding the link to the counterweights.  I just received mine and they are perfect.

TorontoR Posted at 11-7 08:31
Thanks for finding the link to the counterweights.  I just received mine and they are perfect.

excellent,  what phone are you using with them?

They are available in the US on Amazon.com now: https://www.amazon.com/gp/product/B07Z4CGBD3/

They are available on the amazon uk site as well.

DAFlys Posted at 11-7 23:37
excellent,  what phone are you using with them?

Using with a Samsung S10 plus.  When shooting with the ultra wide angle camera, the side of the gimbal was visible so phone needs to be pushed out further which uses to cause an imbalance.  These little weights resolved it.