Jake got one of these for his b-day & since we have a few of us on the board with little super hero obsessed boys, I thought I'd post this tip from my OT chat with glassmanswife:

You can take the top part off the silly string can & put it on silly string cans from the dollar store. You have to save that thing on top though because the ones from the dollar store have a different thing on top & won't work in the web blaster unless you switch them out - but you can just pop it off & switch them.

I know that's about as clear as mud, but I have no idea what to call the thingy on the top of the can. If you look at the can of official "web" (aka silly string), you'll see the grey thing on top, dollar store "web", white thing on top, shaped differently, both pop off & can be switched.