seriously. There was a YouTube video about that. Premiums collapse around 1est even though studies show Monday vol is the highest of the week. responding to the OP isn’t worth the bandwidth cost and the marginal bandwidth is free.
I was in my teens the first time I heard it directly from Saliba. Again later at Ceres in a group and one guy mentioned it and my buddy admonished the guy as I wasn't part of their MMing group. I would have laughed had I not been sworn to secrecy. C'mon, how do three guys keep a secret? (kill two).
Are you asking where I'm getting the option prices from? Spreadsheet calculates them using black Scholes calc...I just plug in the IV. The prices aren't exact in the screenshot as I didn't update IV but close enough.
Whatever Google finance says LOL... This isn't an exact science as I rarely update the IV. It defaults to around 80%.