White Labs yeast is subject to availability. If you are ordering more than one (1) vial, it is advised to contact us via phone or e-mail to verify what we have in stock. If you order more than we have available, we will contact you regarding possible substitutions. Our staff is very knowledgeable! Please give us a call at (510) 849-0400 with any questions you may have. All of our liquid yeast shipments are sent with at least one ice pack to keep your yeast fresh!