Free real-time odds sites help with line shopping, but compare the same market,...

https://papa-wiki.win/index.php/How_Do_I_Shop_Lines_Without_Betting_a_Different_Market_by_Accident%3F

Free real-time odds sites help with line shopping, but compare the same market, such as spread, total, or player prop. Check the book, price, and rules, then verify each detail on your bet slip before you place the wager