Does anyone know a legit place I can bet Khalil Mack to return to the Raiders?

[peteypab89]

I keep seeing articles about Khalil Mack's contract saga. A US Today article had these odds listed as his likely teams after the trade deadline:

Packers +275

Raiders +300

Jets +800

Bills +800

Redskins +800

Steelers +1100

Giants +1100

Field +500

I definitely feel like there's big value in the Raiders at +300, has anyone seen any online books listing this bet option? Or how would I go about betting in Vegas? Can I call a book & place it over the phone, or do you have to be in person? Never bet through a Vegas based book before...