No, it's only entrapment if you wouldn't have commit the crime with someone else. Buying drugs from an undercover cop, which is basically what the OP describes, is not entrapment.
No. entrapment is where I work for the government and try to persuade you to commit a crime. If I merely present an opportunity to do so (eg leaving my car unlocked with an expensive item sitting on the back seat), that's perfectly cool, legally speaking.