You could check the resource page for information on that or other methods. I'm sorry things have brought you to this point though. If you really chose this route PLEASE do not do anything impulsive, plan it out thoroughly. I wish you the best in whatever road you chose. Maybe talking with some of the members here about things might help also. Seems to be a lot of caring folks around.
https://sanctioned-suicide.net/threads/resource-compilation.3/