YES,definitely go through a quilt shop/sew and vac because they will give you the best deal,warranty, free tune up/parts for at least a year. The place I shop at does a 10% discount too for fabric if you buy a machine from them. You cannot go wrong:)
I bought it from the friend privately, though, so I didn't get the above perks, but like I said the price was sooooo right and seller very knowledgeable about her machine;)
Hope you find a great buy---Good Luck!