A friend asked an independent seller of ammo and guns why he always seemed to have .22RF among other hard to get items. He responded that he payed his bills. Eg: he phones the supplier and asked for 40,000 of this or that and gives the credit card number and it is shipped to him. Some of the big outfits, chains etc hold the supplier out to 90 or even 120 days for payment. So as a supplier who are you going to sell to first?