For heat in my fermentation chamber, I have just been using an old soldering in a holder and a 12V fan. I like having a fan on at all times to keep condensation down and temperatures more stable inside the box.
My STC-1000 and my single stage controller were ordered over a month ago. PayPal / eBay managed somehow to send them both (ordered within 5 minutes of each other) to an eleven year old address. The boxes were refused, one going back to Hong Kong, one re-delivered to the wrong address. That is the STC-1000 and it made it to me. The owner of the house it was delivered to knows who I am. One of the club members works for him, and he knows that, too. After the club member asked about the mis-delivered / refused items, they somehow managed to get the re-delivered one to him. It took them no effort whatsoever. Between stupid people and incompetent eBay, this has been a real mess.