E.H.
I myself don't have experience in this area but my good friend is in this dilemma right now herself. She was married and had a family and had a tubal ligation done. Now she is remarried to her soul-mate and they want a baby together, he has no children. But in her case there is no reversal option and IVF is her only option. The cost aspect is tremendous, her insurance covers most of it, but there are no guarantees. But you should research it further because a round of IVF is the the process it may not include the hormones that you have to take before the process, the lab cost of fertilization, and the many other cost that are included. A small hint, it can run into the tens of thousands.
One small question, I'm not being mean in any sense, but if you have a "not so great boyfriend" then why are you even thinking of this?