My mom's storage containers were a mess- it used to drive my husband crazy when we would be over there because he would be helping to clean up and could never find the right lid to match the right plastic bottom. He bought her a system like this one last year for Christmas and they are both happier.
Walmart has Rubbermaid Easy Find Lid 24-Piece Food Storage Containers for $10 with free site-to-store shipping. Next lowest on Google Products is $15 before shipping.
Alternatively, Amazon has it for $11. Shipping is Free with Amazon Prime or if you spend $25 or more. Use Slick Fillers to find other eligible items to help bring your total to $25.