@frogfan
I checked out the nematodes and there are some that are reasonably priced online. If I order some now, and they arrive on a day with highs below freezing, are they going to die if they get left in my mailbox for a couple of hours? If UPS or FedEx delivers, they might be out longer, because there's no telling what time they will be dropped off, on the road by the mailbox about 1/8 mile from the house.
Same question regarding Gnatrol - does anyone know? I didn't find that info. online...