Maine is a funny state; in southern Maine they are converting farmland to house lots, in northern Maine they are abandoning farmland altogether, while in mid-coast Maine we are clearing forest back into field.
I have had a lot of success with clearing forest back into field, its just I really have to overcompensate with nitrogen to get anything to grow those first 6-7 years, but after that it is not too bad. Its all about nitrogen fixation and the availability of nitrogen unfortunately as it breaks down the woody debris of the former forest. It can be done however with a little foresight. So far I am averaging $201 per acre when all is said and done.
FMC's project called AlgeaFiber can really help. I have gotten a lot of it, but that was back when it was free, I think it is $1.50 a ton now. Not bad considering it is billed as a "lime". It has other beneficial minerals in it too however, and while not a certified organic product because it is used as a filter in their processing of carrigean (spelling?) it is harmless stuff. The vast majority of it is pyrite so it really lightens the soil if you have high manganese (like I do) or clay soils. There is one drawback to it...well something that must be accounted for anyway; and while it is cheap...no doubt about it...but it also takes a lot of it. It takes 10 tons of AlgeaFiber to equate to 1 ton of Lime. That means the costs of spreading that much product makes something cheap, not so cheap. Only an individual can do the math on whether it will work or not. That issue has another problem; since you can only dispense 1-2 tons at most to the acre on GRASS GROUND per year, it will take many years to get acidic soil into proper PH levels. That is why it really only shines on tilled fields because so much can be incorporated (tilled) directly into the soil.
If you were only looking at needing acidic soil sweetened, I honestly would think you would be better off getting straight lime. When we spread it here we must get it out of New Brunswick (through the Houlton Border Crossing) so I would think you would get it cheaper than us. BUT as I said, AlgeaFiber has some other nutrients in it that make stuff grow.
BTW: It really stinks. For obvious reasons it smells like lobster bait when you break into a pile of it that has been sitting for awhile.
Here is a former part of the woodlot cleared back into field just after being sown. It turned out to be a really good field, just a lot of work.