If you order more than $1000 worth of art from this site, you can use this discount code to save 10% on the purchase:
VolumeDiscount1000
Just enter this code (or any other discount code you might have) during the Payment phase of the checkout process.
Note: Discount codes only work with pieces that are sold directly through this site, which is the vast majority of them. (Some pieces can only be purchased through external sites, and in those cases, will have no Buy buttons on their pages and instead, links in their descriptions to where you can buy them.) If a piece has a Buy button -- and again, that will be most of them -- you can buy it here and get the discount.