I found aluminum duct tape at Home Depot in the same area where they carry the sheet metal and HVAC air ducts. I used that roll on an automotive project but will pick up another roll soon.

As far as air stones, the more bubbles the better IMO, I bought the largest ones that they had at Walmart.

And another observation for those building a system - its better to go to Lowes or Home Depot and get the black vinyl air line tubing rather than clear vinyl stuff so that you don't end up with algae growth.
MVP Reviewed by MVP on . Building a Rubbermaid Hydro Bubbler Unit - Cheap and Effective Okay gang, here is a quick instructional thread on how to build a home made bubbler. I have seen friends use store bought units that are similar (google for Emily??s Garden). If you wanna see the concept, check out Greg Green's book "The Cannabis Grow Bible" where this idea is discussed as well. Getting started - first the parts list: (1) 10-gallon Rubbermaid Roughneck storage bin (Lowes $5.50) (1) ½ inch I.D. clear vinyl flexible tubing, 12? length (Lowes $0.50) (1) ½ inch Rating: 5