What is line shopping, and does it matter?

Line shopping means checking the same bet at more than one book and taking the best price. On close markets it is most of the edge a bettor can actually control, and it is now measured rather than estimated.

Written by Jesse, NegativeEV. Last updated 12 August 2026.

The same bet is rarely priced identically everywhere. One book posts a team at -145, another at -135; one prices a total at -110, another at -105. Line shopping is the habit of checking a few books and betting wherever the number is best. It sounds small, but on markets that are already close to fair it is the single biggest lever a bettor has, because it strips part of the book's margin out before the bet is even placed.

How much does line shopping actually save?

Across 1,168 MLB games from 2026-04-19 to 2026-07-31 — 90 slates, prices captured at close, a median of about five minutes before first pitch — the moneyline was compared across the six mainstream US retail books. Taking the best of those six instead of a typical one was worth about +1.5% of stake per bet, and about +3.1% against the worst of the six. Shopping both sides of the moneyline to their best price cut the two-sided hold from 4.53% to 2.93%. This is a pure price comparison, not a graded record: it measures what the number itself was worth, before a single game was decided.

A better-than-typical price existed on 95.9% of sides in that sample. The saving is not a rare windfall; it is available on almost every game, and it is roughly the size of the margin most bets are already fighting.

Widen the comparison to all 11 books quoted in the same window and the figure grows to about +2.1% of stake on the moneyline, with the two-sided hold falling from 3.90% to 1.86% — the "roughly halves the rake" version of the claim. That wider number leans heavily on low-margin and offshore books that most bettors do not have and are not being told to open. The retail figure above is the one a normal account can actually realize.

Which bets are worth shopping?

The closer a market is to fair, the more shopping pays. Over the same 1,168 games, across all quoted books, the best price beat a typical one by about +2.0% of stake on totals and about +1.8% on run lines, with hold falling from 4.66% to 2.56% and from 4.11% to 2.17% respectively. Totals and run lines were compared only at the most-quoted total and the standard +/-1.5. On longshot props the prices are thick with margin and tend to move together, so shopping helps less. There the bigger question is whether to take the bet at all.

Is there one book that always has the best price?

No, and that is the whole point. Within the mainstream retail set no single book supplied even four in ten of the best prices, and the rest were spread across the others; the best number moved game by game and market by market. That is why shopping is a habit rather than a choice of book. It also means the figures above describe dispersion between books at close, not a strategy of pricing in the morning and betting later.

Why does the best price matter so much?

Because the edge on most bets is thin to begin with. The two-sided hold on a game line runs about 4.5% at a typical retail book, and taking the best number on each side cuts it to 2.93% - so +1.5% of stake in price is most of the whole margin at stake. Nobody controls whether a game breaks their way, but the number paid for it is controllable on almost every board.

How do you know if the best price is still a bad bet?

Shopping gets the best number on the board; it does not say whether that number is fair. For that you need the true probability. NegativeEV simulates each game thousands of times, play by play, and reports the true win probability and expected value for a bet at the price you give it, free at negativeev.com. So the best price can be found first, then checked to see whether even that price is worth taking.

What can line shopping not do?

Line shopping cannot reach a price at a book the bettor does not have.

The figures on this page compare prices that were quoted, not prices any one account could reach. A best number only counts if the book operates where the bettor is, the account is open, and the bet is taken at the size wanted. The saving is also an average across many bets rather than something any single bet shows.

The measurement behind this page: https://negativeev.com/research/mlb-line-shopping