My boss asked me the other day where he could get some praying mantis eggs for his garden. I told him he could look on Ebay cos that's where I always got mine, since they don't live long enough to mate up here but it might be too early in the year. Sure enough there's a big list of egg cases already.
http://shop.ebay.com/?_from=R40&_trksid=m38&_nkw=mantis+eggs&_sacat=See-All-Categories
http://shop.ebay.com/?_from=R40&_trksid=m38&_nkw=mantis+eggs&_sacat=See-All-Categories