So far I've only checked Walmart for the half gallon ball jars... no go.I've been using 1/2 gal ball/mason jars with plastic sprouting lids for sprouting grain (BOSS mix, oats, barley, wheat) for over a year now. I let them soak overnight so 8-12 hours. Then I drain, fill with water, drain, and sit the jar upside down at an angle. I rinse the grains morning and night for 2 1/2 to 3 days before feeding them to my flock. Almost all the grain is sprouted by then and some are starting to show some green. I started some last night and they will be ready to feed on Friday morning. If I let them go past 3 days, they are hard to get out of the jar. I let my flock backyard range so I spread the sprouted grains all around under the bushes and the girls spend a couple hours happily foraging.
Can you share what type of store you bought yours at?
I currently have 4 plastic (almost 1 gallon) containers that had plastic lids. I had my son cut out the lids leaving an "x" through the middle using a dremel. I cut out circles of that white plastic canvas stuff for crafts for kids. It looks kind of like cross stitch fabric but its plastic and has lots of holes in it. These work fantastic for sprouting but I'd like to expand the operation and I cannot find any more of those particular containers.