Shipping costs continue to increase, and we cannot continue to pay more for shipping than the amount of your sample purchases. For that reason, last year we instituted a minimum purchase amount of $25 for international orders, and this year we have imposed a $5 minimum for domestic (US) orders. This means that if you place an order below the minimum, it will be cancelled and refunded. If you want a single sample (or just a few samples internationally), you can ask to be billed for the shipping charges.
On all US purchases above the minimum, we will continue to offer free US shipping for the foreseeable future.