I've been using a couple of Root Radiance heat mats (10''x20.75''), that I bought from Amazon, and they have worked well for several years. They're just the right size for a single flat, and are moderately priced.
Initially I didn't use a thermostat, but the starter mix was getting up over 90F.
Once I put a thermostat on them, and set to 80F, the germination rates of my finicky pepper seeds improved greatly. The down side is the cost of the thermostats (about $35).
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