Same question, what is the smallest purchase size/quantity?
You are asking the wrong question. Read the post:
We are especially interested in the following types of business partners:
1. Large mining operation owners who can also do massive PCB production of their own.
3. Resellers with various channels and abundant liquidity in cash or Bitcoins.
If you check the boxes on these, fine. If not, you may need to wait for a reseller.