Am just by searching a hotel in BKK for my trip in November.
I found the Tong Ta Resort which is 5 km away from Suvarnabhumi Airport.
On their inetpage I found prices from 900 baht for a single room.
Also the hotel have a 24 h shuttle service to the Airport which will be charged with 150 baht.
http://www.thongtaresortandspa.com
Discription from the webpage:
The Thong Ta Resort & Spa is located 5 km away from Suvarnabhumi Airport. It is easily accessible to the airpor just only 10 minutes. There is 24 hours Limousine service avilable. The hotel is perfect for staying over night especially for passengers who have to catch flight from and to airport.
We entitle all guests to have American breakfasts as a complimentary. There are laundry service, wake up call, taxi, touring information, air ticket as well as free wireless internet access.
We have friendly and well-English speaking staff who can provide information and advice for you. Moreover, you can relax by having our professional spa service during your stay.
There are 67 rooms fully-furnished by brand new furniture and uniquely Thai style decorations. Each room features main facilities such as air-conditioning, TV, water heater, fridge and cable TV. The additional 3 suit rooms feature Jacuzzi tub and large flat screen TV for your entertainment.
