15% of the t-shirt and/or mug net sale price will be deducted when one or more qualifying t-shirts and/or mugs are purchased and the coupon code TEEMUGSPROST is applied at checkout. The net sale price is the price of the product (excluding shipping and taxes). This offer does not apply to screen printed apparel. Offer is valid through September 25, 2011 11:59pm PT. This offer does not apply to past purchases and may not be combined with any other Zazzle promotional or volume discount offers. If a volume discount applies to your order, you will receive either the discount set forth in this offer or the standard volume discount, whichever is greater. Offer valid on Zazzle.com only.