We find it most cost effective to buy a mixed ton of feed at a time. Also, by buying a whole ton of bagged ewe nuts, layers pellets and sow rolls we get the ton price on each feed and free delivery. We empty the bags into dead chest freezers which keeps it safe from vermin but easier to store and make a saving of over £2 a bag.
The recycling centre will usually let you have any old chest freezers they get in but do check them first in case, like me, you take one home that some idle slob has left rotten meat inside, that was an evil job to clean out.