I'm pretty sure the exact same things can be purchased at hardware stores, but try & get the exact replica's..these things are not made equal. i've seen 6 difft kinds since trying to find generic ones.
Similar pucks can be purchased from
www.soundproofing.org, be sure to cut them down to Isoblock dimensions.
Anyone have an idea of what the glue inbetween the 2 separate pucks is? i pulled apart an actual isoblock & would like to get it glued back together. the stock glue is really gummy, non-hardening.