Welcome to QB. I split my time between southern NH and Aroostook County.
Regarding buying a machine from Amazon or big box stores, I would stick to a local dealer. You will get the best possible service (i.e. cleanings, tune-ups, etc.). A lot of smaller shops will not work on machines bought at Walmart, etc. Also, you may be able to negotiate a better price with a small shop (check the manufacturer's website to see if they are running any price promotions on the machine). I was able to get my Baby Lock Jazz at 50% off at a local shop because Baby Lock was selling the machine directly for 50% off.
You may be able to sell your other machine privately. Why not keep it as a class machine/travel machine? If you are a member of the local Pine Tree Quilt Guild chapter, maybe someone in the guild would be interested in buying. There are many quilting resale groups on Facebook. There is a forum here on QB for items for sale. You may have luck selling it here. Good luck.
I don't know where you are in Maine, but 30 minutes away...not that far. I travel that far in the County just to get to a supermarket.
Just my 2 cents...Welcome, again!