I just got supplies in this week. I am going to be making them this weekend. I use a 5cfm 2 stage pump. 3cfm will work. Just make sure it's 2 stage. I paid about $99 8 years ago off Amazon. It still works perfectly
Materials came in yesterday. I will be working on them this week and shipping Saturday morning. Currently will be 4 available. $135 SHIPPED. PM IF INTERESTED