When ordering without Prime it says you have 24 hour (I think) to add other items without incurring additional shipping charges. I don't remember Prime doing this, and there is little benefit to the customer to care, because it's all "free" anyway.

I ordered something on Sunday, I had until Monday to add additional items. I was charged on Wednesday evening, it shipped Thursday (today), and should show up tomorrow.

I can buy the priority method. Sit it on until a lull in demand, or 3-4 days pass, whichever comes first. That's how it feels.

Even though thad had this order for 4 days so far, they are effectively giving me 1-2 day shipping once it finally ships.