Your question is like asking how much we charge for tax returns. There are many factors that go into pricing any personal service that will vary by region, urban v. suburban, the size/reputation/expertise of the firm, and the complexity of the trust. I would never suggest DIY online documents for a trust. Too many pitfalls.
To answer though, around my area a few years ago for basic planning and setup (suburban of Wilmington DE, and definitely less than Philly or Baltimore) I've seen a range of $1,500-$2,500 and more.