I have about 40 moles on my back, and a ton of freckles all over my body. I'm researching this too.
Laser typically is $50 per mole, or $300-500 for the bigger ones, I've read. Check with each clinic. Some charge by the hour. Typically $1000 per.
Liquid nitrogen is the cheapest way ($7 per mole). But a non-skilled or non-caring doctor will leave scars. I might be able to get some, but have decided against it because I don't trust my skill. A good doctor can remove them without scars, but many cosmetic surgeons don't do it because there is not enough money involved. You have to apply it for exactly the right amount of time to the right area and transfer it at the right speed. I had some warts removed with it, and can't see any scar at all. My friend had warts removed, and she has scars that are almost as bad as the warts were.
They can be cut off, but that leaves scaring. Sometimes the genetic material can be deep.
I've had a few small, tall ones, and cut them off with a scissors. Yeah, it hurt, but not bad. I can't even tell where they were. It is the big flat ones I don't know how to treat.
My brother used a Dr Schoules (spelling?) Freeze It thing to freeze some big moles down. They are still there, but much flatter and not colored.
My friend's mom used some kind of butter. Shae butter? I forgot the name. She rubbed it on her skin for several weeks and they disappeared.
There are other products on the web for $30 that say they can remove moles in a month. I don't know if they work.
You can buy Salicylic acid (for warts) and eat the moles off with that. I don't know how effect it is though, or if there would be scaring. US doctors think liquid nitrogen can cause cancer, and european doctors use it and think cutting them can cause cancer. Yeah, and some doctors think the salisylic acid can cause cancer. I don't believe any of it. I'd be more concerned about the cosmetic effect. The acid is cheap. It works much better if you let a drop of warm water soak into the mole, and remove left over surface water, before adding a drop of acid. I hope it does not scar you though.
If you find anything else, please let me know. I suggest experimenting on one mole in a non-conspicuous area. I'm saving up for laser, but might try some of the acid. I can maybe get access to liquid nitrogen, but I just don't know what it will do. The acid should be easier to control.