New source for cheap primary buckets
I was in a local donut shop a while back, and I noticed in the corner they had buckets stacked up, and on them a sign that said 3 dollars. These were 5 gallons and at one point contained donut supplies like cream or custard. Not bad considering I paid much more for mine when I got started.
You might check with a local shop, mine sells them but yours may just give them to you.