Some affordable marketing options may be with your local college - one with an MBA program. Talk to some professors and see if you company can be a project the class works on and provides you some ideas. It won't be expert - but it will be free.

If you cannot afford it - do you have time to study it?

Get clear on what you need - if you need overall strategy I am sure that there are plenty of people on this site that you can get 30 minutes to bounce some ideas off of..

If you need technical work completed - again maybe a paid internship. My son was paid $10/hour - but needed to be told what to do...

Good luck!