I used to have to give them a pass, there were so many... Now I can't find enough to bake a loaf of bread.

Barrels
Shops
end tables
Most containers

Have you tried a general store

to make some yourself you need Heljarchen Hall and build a grain mill.

(Never tried to use a mill in a village.... maybe they also work.)

3 Wheat = 1 sack of flour.

A lot of hearthfire items do that to me.

I saw goat horns in stores a lot and didn't know what they were for.

Get a house and start upgrading it. No where to be found.