It's a lie that subscribers get the best price. Buyer beware - it will cost you more to subscribe.
Beware: If you subscribe for auto delivery, you will be billed at the highest price for their shirts. They have a promise on their website that they break over and over again. The promise states: "UNLOCK OUR BEST PRICE PER ITEM ThreadBox subscribers get rewarded. Never pay anything but our best price when you subscribe." It's untrue. Today, I can use a promo code and manually order 3 shirts at a $10 savings over the price they automatically charge on subscriptions. It's just an outright lie when they say you'll get the best price. You won't. They do not apply any current promotional pricing, so the best price is only available if you don't have a subscription. They've done this with me now twice and it feels very unethical and dishonest. Stay away from the subscriptions if you truly want their best pricing.