Right now Dell Small Business is offering an additional 10% off coupon code (Q7CS3QZHW34KSV) that is stackable on current discounts on monitors. 

Restrictions: Excludes medical displays, all Dell S-Series Monitors, the Samsung 2333SW 23" monitor, Dell 1707FPV, Dell E178FP, Dell E198FP, Dell E2009WFP 20" monitor, Dell UltraSharp 2208WFP 22" monitor, and the Dell UltraSharp 2408WFP 24.