When booking a Marriott hotel room online, you have the opportunity to enter a discount code in the “Corporate/Promotional” box.

Here are several to try — some may work out way and others not so well with any given property and date.

• M11 = Marriott Rewards special
• BOG = Buy One get One Free at Springhill Suites
• WCT = Washington DC Tourism Coalition
• TZO = Travel Zoo Special offer rate
• W8S = Go West rate
• WSAS = Southwest $10 off and breakfast for 2
• SOWK = 15% off Arizona and California
• N8R = Eastern hotels-$50 bonus bucks for up to 2 nights(certain properties only)
• LVU = Love You
• HON = Honeymoon
• PKF = Park and Fly
• PKG = Special rate packages available (escape,honeymoon,parking etc)
• PES = Escape Packages
• I24 = Renaissance hotels
• CUE = Washington and Baltimore packages

If you try variations on company abbreviations, you can find several negotiated corporate rates. FRD is for Ford Motor Company. There’s also UPS and PEP and FED and a myriad of others. Check the rate rules, though, because some do require an ID at checkin.