From hacker news:
I am an IP litigator, and I have dealt with patent trolls repeatedly. I have taken these kinds of cases pro bono in the past for small companies (including through the EFF attorney referral list, https://www.eff.org/pages/legal-assistance), and I know that others have as well. There are definitely low-cost and pro bono (free) options out there for very small businesses. The EFF attorney referral list is a good place to start.
I'm also happy to talk it through with you if you'd like more specific information - my contact information is here: https://shawkeller.com/attorneys/andrew-e-russell/