I have access to over 40 well pressure tanks. These with tops cut off can be made into some nifty DIY filters. Mostly free for the picking up at my place or if I haven't gotten them all yet I can take you down to where I'm picking them up. I was told these can also make nice big planters..cut in 1/2 or I may use some on their sides for a raised bed type thing.
I am located in the Yakima, WA area