The 35 pound boxes work well and agree that Sam's always has the best price.
I fried two 13 pounders on Sunday night for a retired VP of the company I work for. Had to serve 23 people, most were originally from England and said it was great. Feeding Cajun Fried Turkey to to a bunch of Brits- that was risky. The first turkey served everyone, then half of the second turkey was eaten with the second and third trips. My first venture at it for a fee. Thankfully all went well.
I only had a few samples since I was paid to cook and serve, but I am ready to cook my own this year.