Line Shopping Explained

Different sportsbooks do not always post the same prop at the same number, and they rarely post it at the same price. Line shopping is the simple habit of checking the same prop across books before you pick, and taking the best version of it.

Two things to compare

There are two things that can differ, and both matter.

• The line, which is the number itself. One book might post a receiver at 59.5 receiving yards and another at 57.5. If you want the over, 57.5 is the easier number to clear.
• The price, which is the odds on each side. Two books can post the same 59.5 line, but one at -110 and the other at -120. The -110 side pays more for the same outcome.

Why small gaps matter

A couple of yards, or ten points of price, looks tiny on one prop. Over many props, taking the worse number every time is a slow leak. Because the book's margin already works against a bettor (see reading betting odds for why both sides add up to more than 100 percent), giving away another edge on top of it stacks up. Line shopping is how you stop handing that back.

How to do it without ten tabs open

By hand, line shopping means opening several books and comparing the same prop in each, which is slow and easy to lose track of. A line-shopping view does it in one place: it lines up every book's number and price for a prop in a row and marks the best one, so the comparison is already done.

A note on availability

Lines move and props come and go, so the best number right now may not be the best number in an hour, and a prop you see at one book may not be posted at another at all. Line shopping is a check you do close to game time, not once in the morning. It also does not tell you which side to take; it only makes sure that whichever side you pick, you are getting the best version of it on offer.

What moves a line

Lines are not fixed. A book opens a number, then adjusts it as money comes in and as news breaks. A key injury, a change in the weather, or a lot of bets landing on one side can all move a line or shorten a price. This is why two books drift apart in the first place: they do not take the same bets at the same moments, so their numbers wander from each other. It is also why the best price is a moving target, and why the check is worth doing close to when you actually plan to bet.

A small worked comparison

Say the over on a prop is -110 at one book and -120 at another, on the same 59.5 line. At -110 you stake 110 to win 100; at -120 you stake 120 to win the same 100. Same outcome, same line, but the second book asks you to risk 10 dollars more for nothing extra in return. Once, it is small. On every prop, all season, it is the leak line shopping is there to catch.