Payment is due anytime after placing the order. 
It can take between 4 - 8 weeks to receive items, depending on how big the buy is. 

IMPORTANT: SINGLE VIAL items MUST BE PLACED IN A SEPARATE ORDER, or they will not be filled until full order is available for reship. 
If you need to add items to your order, you will need to make a new order, so please make sure you look through all the items before checking out.