I'm wondering about the effectiveness of some of these termite treatments like Spectracide(?), Terminate(?) for preventing infestations. It's a heck of a lot cheaper than Sentricon through an exterminator. We live in an older home with a stone foundation and a plaster/lathing ceiling in the basement. Active termites were found during our home inspection before we bought the house in June and it was (spot) retreated. Thanks very much.