This works for an online account. Basically if you like a side, just make it a parlay with a total that has a 1/2 point on it.
For example if you like Louisville -3 tonight and you were planning on betting $110 on Louisville to win $100. Find any game with a total that has a 1/2 point on it. Bet $50 parlay on Louisville/Under and another $50 on Louisville/Over. You are guaranteed not to push on the total as long as you select a game with a 1/2 point on the total.
If Louisville covers the spread, you will win one of your bets at 2.6:1 paying out $180. You will lose the other $50.
Instead of wagering $110 to win $100, you have instead wagered $100 to win $130.
Take that online books!