Post your codes HERE. PLEASE.

Accor: to
50% off second room for children. No code needed. Sofitel, MGallery, Pullman, Mercure, Novotel and Suite Novotel hotels. Under 16s only.

Agoda:
5% off hotels AGODASALE (appears you have to enter through a link found here: https://www.agoda.com/deals, then a promo code field will be available.)
5% off code: BOOK5
YMMV 5% OFF code: LETSGO
YMMV $10 off code: BOOK10
5% off Hotels code: GOHOMES
5% off code: VACAY
$10 off $140 min code: GET10
$10 off $140 min code: HOLIDAY

America's Best Value Inn
15% off America’s Best Value Inn with BusinessAdvantagePlus.com discount code BAP

Aqua Oasis (Honolulu)
15% off Aqua Oasis in Honolulu: PARADISE [dates unknown]

Best Western:
Facebook Fan rates, up to 20% off
19-25% 00322510 Under special rates - Type in under 'corporate rate'
15% discount 01476170

Promo codes:
tweet1 10-30% off depending on property.
BWGIFT or BEGIFT Up to 25% off
FREQGST 20% off
WEBONLY 25% off

01402610 20% off, enter as corporate code
01353080 10-35% off, enter as corporate code

Cheaptickets:
Cheap of the Week: http://www.cheaptickets.com/travel-d...e-hotel-deals/
Official Promo Codes: https://www.cheaptickets.com/g/lc/tr...pon-promo-code
10% off - details unknown. HOTEL10

Choice Hotels
up to 15% off: Code 00845160
Or use this link: https://www.choicehotels.com/?clientid=00845160
up to 20% off: Code 00263630
Or use this link: https://www.choicehotels.com/?clientid=00263630

Club Carlson:
Full English breakfast, priority early check in and late check out at Radisson Blu Edwardian hotels in the UK.
Promo code: AF5BK

Easytobook.com: (use codes at Cheaphotels.nl)

ebookers.com:

ebookers.ch:
18% off with mobile app: APP18

Expedia (Make sure to check credit card requirements):
8% booking of $400 or more use code: HOLIDAY21MD


Extended Stay America:

Fairmont:
Stay 2 nights Get 15% off +$50 hotel credit code: PVI1 https://www.visa.com.sg/en_sg/visa-o...resorts/138035

Galahotels.com:
5 EUR off (minimum spend 20 EUR) with coupon code SAVE5EUR

Hilton family of brands: MVP rates http://stay.hilton.com/mvp/

HotelClub:

Hotel.de:

Hotels.com:
Stay 3 nts and Min spend $130 Get $20 rebate Hotels.com rebate: https://www.hotels.com/page/rebate/
$25 off $250 code: PROMOS4U25 exp 12/31/20
8% off when paying with Visa code: VISA8 https://www.visa.com.sg/en_sg/visa-o...telscom/110886
$50 off $350 You can get a unique code when you make a groupon purchase. After the purchase there are some prompts for further offers. Was sent an email with the unique code.

HotelTravel:

Hotelopia:
8% discount code: HOTELES8
6% discount code: HOTELES6

HotelTonight:
$25 off your first booking using Hotel Tonight minimum $135 TONIGHT
10% off when you use your Capital One Venture or Venture One card to purchase with the code VENTURE.

Hotwire:
5% off Hot Rate Hotel and Car MY5OFF ($100 min purchase)
$30 of $250+ NEWTOME

IHG Group Hotels
100210125 up to 14% off

Joie de Vivre:
15% off code: DIRECT (from their Facebook page)

Kempinski: Dedicated codes thread

Motel 6: Dedicated codes thread
15% off. CP565474

Orbitz
10% off hotels code: BOOKNOW

Orbitz app
15% off hotels: APP15 (as of 1/23/2018)

Otel.com:
5% off: OTEL5OFF
$35 off $500: USOFF35

Preferred Hotels & Resorts
10% Off + Complimentary Breakfast for 2 code: MKTVWO https://www.visa.com.sg/en_sg/visa-o...resorts/138162
15% Off when you stay 3 nts at Residence Properties code: MKTVRO https://www.visa.com.sg/en_sg/visa-o...resorts/138164

Priceline:

Red Roof Inn:
20% off
Promo Code 610467
? discount 543842
15% off code 602006

Travelocity:
10% off select hotels: TRAVELOCITY10
15% off using mobile app: MOB15 (no T&Cs in post #5279)

Travelpony:
$35 off $200: see Travelpony referral conga Conga:]Conga: $35 off Travelpony $35 off Travelpony

Trip.com:
5% off Hotels Book on the APP your first time and receive 5% off
Book with a Visa card and receive CNY 80 off Mainland China hotel bookings (CNY800 or above) until 30 September 2018 using promo code VISA2018 (see https://www.visa.com.sg/pay-with-vis...offerId=123998)

Venere
Venere Mobile App
15% off MOBAPP15

Wyndham:
Wyndham Hotels 20% off, ongoing promotion. Just book through this link: http://www.wyndhamhotelgroup.com/?co..._id=8000000066
Or if you want, use 8000000066 as a coupon code. (Allied Business Network)

20% off using corporate code 1000008537 (S&T Bank) https://www.wyndhamhotels.com/?corporate_id=1000008537
20-25% off 1000008946 (Civil Air Patrol) https://www.wyndhamhotels.com/?corporate_id=1000008946
up to 20% off: 1000005930 (Motivano Employee Programs) https://www.wyndhamhotels.com/hotel-..._id=1000005930
up to 20% off: 1000020056