Hey David...I'm using the Phillips Sonicare e-series tooth brush. That's for my teeth and for the model sander( NOT the same handle for the teeth...LOL). So...it works out pretty good for replacement heads for the sander. Right now I've got plenty of heads in the storage box. The cheapest place I found to get one of those Brushes is at Target. I think thet're around $60.00. That's cheaper than Micro Marks electric model sander. I get the head refills at Walmart. They come in sets of three for around $20.00 some dollars. The double sided sticky Foam I found at Michael's Craft store.