In that case just a heat belt and one of those rubber buckets you get in Aldi from time to time. You can wrap a blanket around it for insulation and the bucket is great if your brew is getting too warm then you can put water and ice in it. The heat belt should have an adjustment dial and you can dial it in with the a temperature strip stuck to the fermenter. Takes a bit more effort & monitoring but it's cheap as chips and was my first setup.Yes I noticed this combination of products mentioned elsewhere and would seem like a great idea to me were it not for the price tag.
I consider myself something of a budget brewer, hence attempting to achieve an acceptable temperature with blankets lol. However it occurs to me; if the addition of a heat pad is all I need to keep winter brewing this is an attractive prospect to me.