How to learn SAP ERP (without buying it)?

Some universities offer degrees during which you learn SAP. Some companies are willing to hire you even if you don't know SAP and train you. I came across both situations. Probably there are some courses as well.

EDIT: But I agree with the TFD: unless you are very into money(SAP jobs are very well paid) look for sth different.

you can get a trial version here. the installation should not be too hard and there are many books which will help you.