We are all crafters on the design team and don't have expensive professional spray booths in our home, so what do we use?
I started out with cardboard boxes that I got from our office supplies warehouse, they held paper pads so were quite strong, and A3 sized, perfect! but we stopped getting pads packed this way BOO! how dare they?
DT member Lynne Vowles uses the boxes that boots come in and tells me that shoe shops are happy to get rid of these and may save some for you if you ask.
I am a big fan of spraying out in the garden, especially if I want to do big sheets of card. I have been known to re-purpose A1 mount boards this way, spraying over the boring white back. Elaine Kettle likes using her garden too.
I started to use a cat litter tray I am fairly certain didn't cost me very much. This is Barbara Daines method too.
The cardboard boxes are cheap or free but won't last for ever. I used to lay a craft mat in the bottom to collect the over-spray which makes the great source of ink more use able. Plastic on the other hand, it washes out. If you are changing colours a lot I suggest you wipe out your tray with some kitchen roll, or better still soak up excess ink on a tag or scrap card.
Then I as I was teaching bigger and bigger classes I decided I needed something not too expensive and that stacked. I would have gone the cat litter tray route had I been able to find a cheap source but I was going through a "use what you have" phase of my life and realised I had 20 of these trays from Ikea, it did mean emptying a few, but it worked, and I will be buying more of these for the Autumn classes.