Where to buy: asphalt expansion tape and butyl tape

[NeedsMoreToys]

I haven’t founded a place that sells either tape in longer rolls. What I did find was pretty expensive per foot. Start adding that up across every joint and log it gets real pricey. Where do you buy you asphalt and/or butyl tape?

[kantuckid]

To use where? 

[sprucebunny]

I bought butyl tape to use on a steel roof on Amazon. It's not cheap.

[Sod saw]

Hi Toys,

I have gotten tape from window shops.  They use it between layers of fixed glass. It comes in rolls but not to wide.  I have also used some wider rolls to go in between the top half and the bottom half of some 2500 gal concrete septic tanks while placing the tanks in the ground.  Those rolls are wider than the window tape.  

Edit:   Butyl