Looking for the slide lock ring that screws onto a Yamah YBL-322 bass trombone.

Also would love a key for the Yamaha trombone case to keep the 3 yr old out and the trombone in.

Can paypal, venmo, etc.

You should be able to buy both of those things directly from Yamaha via their consumer parts portal:

https://www.yamaha24x7.com/

I've ordered parts from there several times, it's always been great.

You'll just type YBL-322 into the search and then you can order pieces/parts right off of the schematics