By my estimation, Galls is a lot like Grainger: a generally convenient one-stop shop, and with higher prices to show for it. You're sure to find lower prices if you do the legwork yourself. However, it seems as though you're looking for both a low price and stock on hand. Green lenses for an MX7000 may prove hard to find in stock at any dealer, mainly due to first to the age of the platform and second to the relatively low demand for the color.