Anyone know where I can find free search and rescue training or an EMT-B course? Thanks!

Don't know what country you're in. Not many know what free training
Is available worldwide. Not much is free these days. Check this out
If you're in the UK. The YMCA also offers some classes in the U.S.
But in order to get the type of training you want for free, you might first
Need to be hired by an organization or military unit that uses it.

YMCA Training

You are not going to find it free unless a company you are working for will send you.