When you bake them, a toaster oven is standard but they are notorious for not being close to accurate. My garage sale $5 toaster oven has baked several thousand jigs. However, I melted some of the heads completely off before I figured out that it was very inaccurate. Mine works best at the 250° setting and baking for 10 minutes. Check it often until you get it figured out.
When I decided to get a fluid bed I was making 1000 jigs each year for a customer and using the jars. Fluid beds were going for $400 each at the time. Mike Seibert sent me some directions and I built my own for about $30 with components from Wal-Mart and Lowe’s.