I have a bunch of old heating pads that I have used for years. The ones in the store now automatically shut off after 30 minutes or so therefore you have to get ones that don't do that. The heating mats for
seed starting are way more expensive!!! I don't have anywhere to sprout the
seeds that is warm and cat proof so that doesn't work for me. I just plant in
seed trays on a heating pad set to med-high.