Tip 1) You can extend the "life" by lining the trays before using the inside with aluminum foil. After use, you simply throw away only the dirty sheet and can reuse the shell. The shells are robust enough so about 4 - 10 Grill actions to survive before they become unusable (holes, cracks, ...).
Tip 2) As described here already several times, many Griller going to be used on stainless steel drip trays. The search term "drip tray" Just enter here at Amazon and you will find a wide range of easy - to noble containers. With a 57er Weber kettle grill but the page width should not exceed 23 cm, otherwise the charcoal baskets no longer fit in. The standard size of 23cm x 32cm is ideal here. If someone is too short, you can vary in length - up to 40cm. Only the side width of about 23cm should not exceed if you want to use both coal baskets you. - That fits in every dishwasher.