Hey did you actually read the OP's Post? He is asking to buy a method not sell it, BTW OP There are actually no methods to get the google cloud $300 Trail, Google does not accept VCC so no matter how much you load them up with you won't get the account, Unless you want a method that involves hacked CC, But that would be totally illegal and i don't recommend going that way. You can try the AWS method they do work with the VCC.

superiorus for Google Cloud, Google Asks the person to give real CC details , After a small charge on the credit card, Google approves the $300 Trail, As for Emails yes there are different methods to get verified Gmail accounts but those don't come with free google cloud trail.

Vcc doesn't work for google cloud

After that, you still need to approve your Google Account with a ID proof + Bank statement.
Otherwise, GC suspend the acc in minutes.

Yup Google Patched the whole long ago, The Problem with the "Methods" are that they get spammed. So the company has to forcefully decline all sorts of VCC, Even if they are legit, So if you find a company which accepts VCC don't try to abuse it, They will patch it sooner or later.