Happy Hour Sale offer valid January 21 at 11:00am CST to 3:00pm CST. Credit will be applied to existing Sigma Beauty customer account by next business day. Limit of one $20 credit per customer account. All payments are subject to verification. Sigma reserves the right to delay shipment or cancel any order or promotion for any reason, without notice. Subject to in-stock levels, no rain checks. Offer not valid on previous purchases.