BetJam has a nice March Madness Contest. You have to make $100 in real wagers on March Madness games to qualify for the prizes. Otherwise it's 20%.
Here they are. There will probably be 2-3,000 entries.
1 $10,000
2 $5,000
3 $3,000
4 $2,000
5 $1,000
6-10 $500
11-20 $250
21-30 $125
31-50 $100
51-100 $75
101-200 $50
201-300 $25
Here they are. There will probably be 2-3,000 entries.
1 $10,000
2 $5,000
3 $3,000
4 $2,000
5 $1,000
6-10 $500
11-20 $250
21-30 $125
31-50 $100
51-100 $75
101-200 $50
201-300 $25