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You can get a $1 trial with creditchecktotal and get all 3 fico scores.
CCT. Though keep in mind if you need mortgage or auto lending fico scores in addition to standard fico8 I don't know that you can get them anywhere else but myFico.
Cheapest?
You could get all 3 of your reports for free at annualcreditreport.com
And you could get all 3 of your Fico 8 Scores for free each month by applying for credit cards that offer those scores for free to account holders. For example, First Bankcard for Experian, Discover for Transunion, and Citi for Equifax. You can also get your Equifax Mortgage FICO for free each month by opening a checking account at Digital Credit Union. I've heard that there are others as well for the Mortgage FICO's for Experian and Transunion.