I just looked on the NYWorms site, and they are priced at $2.50 each, or 3 for $6.00 ($2.00 each). The best price I've found so far on 40 hour heat packs is $1.50 each at americancricketranch.com . Hope this helps.
: : I am in desperate search of 40 hour heat packs.. anyone know where i can get some for a reasomable price?
: http://www.nyworms.com has 60 hour heat packs available. Wouldn't use anything else in the cold winter months! they are an expensive $6 ea, but worth it, they just keep going for days. :o)