I figured since this applies to getting messy it would fit here but if it belongs more in the off-topic can the mods please move it there?

Anyway, I was just curious where everyone gets their plastic sheets from? I usually get mine at like home depot or Walmart but it really starts to add up and with the big rolls being super heavy they aren't very cheap to get online because of shipping. I am in the US so if anyone in this part of the world has found a decently prices place to get this stuff a little cheaper that would be much appreciated.

Plastic shower curtains from the dollar store. Can't beat it!

We get ours from Home Depot and buy their HDX brand. But my local store is only about 2 miles away. And the shipping is free whenever I order anything. We use the thicker 2 mil for the 'main' tarps, and the 0.7 mil for the 'splash guard' tarps. We need those thicker, larger tarps whenever we do slime because almost all of our slimes are 5 gallons of slime per sliming.

As opposed to the DIY sheds, have you tried a local builders merchant? this is what I did, but I am UK based.

Walmart.com , and they deliver to you, so no weird store trips.
Brand is "Husky" and as The Man mentioned, 0.7mm for the walls, 2 mm for the ground.

I've been using those husky ones too, I was secretly hoping there was magic place that had cheaper bulk plastic rolls. I appreciate all the feedback!

I use the 10 foot xy 20 foot plastic rolls from Lowes.com. They are not cheap but they are thick and do not tear. You can purchase a 10 x 10 foot sheet that is not very expensive and they are easy to wash and clean up. I get the more heavy duty kind as they do not tear or rip and I can take them outdoors and wash them off with a hose after a mud or oil wrestling match and these plastic tarps are thick and durable enough that you can keep them for years.

I usually wash them off outdoors and let them dry in the sun then store them in a plastic pin to keep them and can use them over and over again. So again they are not cheap but will last for as long as you want them if you take good care of them.

Maybe look on line for plastic sheeting that they use in spray painting shops. Can get some that open up to 6m wide and normally are 100m in length.

SAME!!!!