Grab a drill and make your own I will post a video showing you my 11l that I drilled up and how I found most productive way to drill.My ultimates finish in around 90 days, so 13/14L+ 6L buffer.... I either have to use 15L smartpots, normal 20L plastic pots or pay like 300 pounds for shipping + the price of 50*22.5L airpots...hard choice...
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Check out our friendly grow off when you get a chance. Show some love if you got a bit to spare.
https://www.autoflower.org/index.php?threads/52772/