I know this question was asked a couple years ago, but I just recently had experience with this so I figured I'd answer anyway...
I've reused yeast from salsa jars and tomato sauce jars. I would've bought some new mason jars but I have no need for a pack of 12 (nor the desire to store them). So I went the frugal route, cleaned up the jars, threw them in the dishwasher, then soaked them in oxyclean when I was removing labels from bottles and... they've worked great! No issues with the reused yeast.
So I'm not necessarily recommending this, but if yeast washing day arrives and you're low on options, it's worth a shot