Through the tournaments I have traveled to whether it be west coast (drive to), or east cost (fly) I would spend, on average, $1,000 with no sponsor contribution per event. This was for NPPL 2006 - 2007 season.
My prices include:
-travel ($50 if we drove, $300 to fly)
-hotel (wed - mon 4 to a room ~$150)
-food (eating out all the time and stuff for the trip ~$150)
-paint (about $50 per person)
-entry ($200-$300 per person)
-nightlife and purchasing merchandise were extra but I could never resist
This is just from my experience. You could spend less several different ways.