Amazon.com and Bed, Bath and Beyond both sell plastic microwave rice cookers, as of 2015. One model from Amazon.com is the Nordic Ware Microwave Rice Cooker, and one from Bed, Bath and Beyond is the Infuse 15-Cup Microwave Rice Cooker Set.
The Nordic Ware plastic microwave rice cooker from Amazon.com is about $14 and has ratings of 3.5 stars out of 5 stars. It has an 8-cup capacity, is dishwasher safe and cooks rice in a matter of minutes. The Infuse plastic microwave rice cooker set is about $15, is dishwasher safe and comes with a limited warranty. The set includes a cover, cover plate, bowl and rice paddle. It also comes with a measuring cup, steamer insert and steam-circulating inner lid.