Maple syrup is one of the more expensive products on the market per serving so you will be looking at spending a bit more than your generic corn syrup based maple products. There are, however, non-GMO products available that are not too hard on the pocketbook.
Coombs Family Farms is a family-owned farm located in Vermont, where they produce organic and non-GMO certified maple products from start to finish. For the average syrup consumer that uses maple syrup on pancakes and occasional food preparation, their syrups available from Lucky Vitamin will serve your purposes. Thrive Market also sells Coombs Family syrups and they slightly less expensive.
Regular customers give Coombs Family 5-stars!