There's always lots of the glass ones with the wooden paddles at local antique malls around here, but often the wooden paddles are in bad shape because our climate is so arid so those would need to be replaced. I've toyed with a few over the years and they seem to have good action so I'm sure they would work well.
We have access to excellent butter, but when I've made butter with my Girl Guides (same as US Girl Scouts) we've just used baby food jars--they shake, then plop the lump of butter out to wash and squeeze in a collander in the sink while they wash out their jars, then take the butter home in the clean and dry jars. It does make for a line-up at the sink, but we usually do it on "heritage home skills" night when we have several stations going: jam-making (we do freezer jam with the Guides because it's faster), knitting/corking/crocheting, patchwork quilting etc.