I got it at the same place I got my tent, a local grow supply shop. A kiddie pool may be good substitute if you can’t find a tray (or until you find one)
I googled ‘grow tent drip tray’ and found the same one I bought for $20 less (but shipping would have been restrictive for me)
4 fit in it pretty good tho one is almost crowding the others 
I want to try just 2 with a scrog next
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