I have a local roaster who sells roast-to-order beans by the pound. He estimates how much green coffee it’ll take to produce a pound after roasting. Sometimes you get more than a pound, which is a nice bonus.
I will say, at the rate I go through coffee I actually prefer 12 ounces. It makes it easier for me to keep the coffee fresh. I usually order multiple bags of beans and vac seal freeze all but one bag. That local roaster’s coffee is so good though, so I may order from him again soon!