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I've heard that if you first coat the plastic container with olive oil, that keeps the tomato stain away.
Place your plastic in the sunlight to remove stain; it's free.
Use some hydrogen peroxide with your regular detergent. The hydrogen peroxide is the active ingredient in the Cascade Plastic Cleaner.
Make friends with your local Tupperware dealer. It is usually on sale for about $1 if you buy some Tupperware, but you can ususally get them to tack it on an order from someone else who did not want it.
I have also tried the olive oil trick and it works pretty well.