Bet365 was offering 5 to 1 on 2-team parlay's and 7.5 to 1 on 3-team parlays which had to have some sort of restrictions.
but I know Bodog offers this.
2-team... 14/5! ($100 parlay wins $280)
3-team...6.25/1! ($100 parlay wins $625)
4-team...12/1! ($100 parlay wins $1200)
5-team...25/1! ($100 parlay wins $2500)