Service codes are issued by customer support only for very specific reasons, not just because you want a discount.
https://ttlc.intuit.com/community/charges-and-fees/help/what-is-a-service-code/00/25646
Perhaps you can take advantage of an affiliate discount:
HOW DO I GET AN AFFILIATE DISCOUNT?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-account-billing/get-turbotax-affi...
Or—-Use this IRS site for other ways to file for free. There are 8 free software versions available from the IRS Free File site
https://apps.irs.gov/app/freeFile/
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**