Pickled Beets

My husband has started eating pickled beets at work and he really loves them. Today he asked how they make them and here is what the guys do.
1 gallon sliced beets
1 gallon clean empty jar
2 c. sugar
2 c. apple cider vinegar
Dissolve the sugar in the vinegar. Put the beets and vinegar mixture into the jar and let the flavors meld for 24 hours in the refrigerator.

I need to find a source for gallon glass jars.