$39 a night if you're trying to save a few bucks - but be warned it's a $hithole
Travel Inn & Suites
17607 Highway 59 North
Humble, TX 77396

These are better accommodations but about twice the price:
#1 Hyatt Regency Houston Intercontinental Airport - may offer you a flight crew discount - the restaurant was decent when I was there last - several airport shuttles
#2 Houston Mariott North

Plenty of others in the area, these are just the ones I have personally stayed and paid for.

If you haven't stayed around IAH before - it is not in a good area - stay clear of the "Greenspoint" area on foot.