Books -- good books especially -- on Universalist or Unitarian history don't come around every day, and when they're gone, those who didn't buy will kick themselves later.
Few books on Universalist history are as good at Ann Lee Bressler's 2001 Universalist Movement in America, 1770-1880, and I've put it back on my to-read list.
A quick search suggests that Oxford University Press has remaindered it. I've seen new copies for sale for about $13. Buy it now, or regret it later.