A little while back, I swapped out my plastic mixing bowls for glass mixing bowls. The same Pyrex set I bought, has a big price drop right now on Amazon. Amazon has temporarily dropped the price on the 8-pc. Pyrex mixing and storage bowl set with lids down to under $15!
The set includes 4 glass bowls (1 qt, 1.5 qt., 2.5 qt., & 4 qt) and 4 lids and normally sells for $24.99.