Vintage Pyrex is highly collectible and a good seller on eBay. There are so many patterns out there, but this post will focus on the blue and white Amish pattern. This is the one we had in my home when I was growing up. I remember my mom mixing brownie batter in the big white bowl with the "funny ladies" on the outside.
You can find the single pieces (bowls, casserole dishes, butter dishes, baking pieces, etc.) at thrift stores for $1-$3 each. Also check garage sales and estate sales. Here are a few recently completed listings for vintage Pyrex in the Amish pattern.
Vintage 50s PYREX TURQUOISE AQUA Amish MIXING BOWL SET
Vintage Pyrex Turquoise Amish Butterprint Mixing Bowl
VINTAGE PYREX TURQUOISE AMISH BUTTERPRINT NESTING BOWLS
Click here for my free list of thrift store items to sell on eBay.