Amazon offers its Prime members the Pyrex Pie Plate Portable, model no. 1087999, for $6.99 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, shipping costs $7.90.) That's $2 under our mention from five days ago and the lowest total price we've seen. (It's a current low by $10.) It measures 9" and is oven-, microwave-, fridge-, freezer-, and dishwasher-safe.