You can still file using the TurboTax Business software to file your partnership tax return and generate the K-1s you need to file with your personal return. E-filing (even if late) doesn't end until October. Those services you mentioned are primarily focused on individual (not business) tax returns so I doubt they would help you anymore than using the Help section within TurboTax Business. You can always attempt to prepare it yourself since you already have the software.
If you have issues, questions, or concerns when preparing the return, it would probably serve you better to find a CPA or Business Tax Expert in your area to assist. You can always ask questions here in this forum too.
CPA License Verification - Find a CPA
Filing a Business Tax Return
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