Amazon currently has the Salads To Go eBook for Free! Be sure the price states free or $0.00 before purchasing!
These are a genius way to make up some salads ahead of time so you can try to have a healthier lunch on hand to grab and go throughout the week.
Amazon also currently has the Ball Wide Mouth Pint Jars with Lids and Bands, Set of 12 for $9.87 which are good for side/smaller salads. These are labeled Freezer Safe, too, in case you decide to use them for other things.
Keep in mind that prices flip fast on Amazon!