It used to be that there were a few offshore books that offered 6pt 2 team NFL teasers at +100. Mansion is one that comes to mind. Are there any left?
What about 6pt 3-teamers at better than +180?
In the early 80's, when teasers were considered "sucker" bets, I had a local who let me wager on 2team 7pt even money teasers in the NFL. He ended up owing me.
