I just don't get them. My one email account was getting emails from them, last one on 7/23, no Banner offer btw. I ordered a banner and used a different email address for it and Friday got the
expired $5 offer at that address. Here's what it said at the bottom of mine:
"* To get your $5 Banner, enter 5BANNER in the promotional code box at checkout online at
www.shindigz.com. Offer applies to the 18x54-inch banner product size (items: B1118, K1118, K1154 and B1154). Limited to the first 1,000 orders. Offer can be redeemed once per customer, per organization, or household. The 5 Dollar Banner offer cannot be combined with any other offer or previous orders and does not apply to Attach'N'Go banners. Shipping charges will apply. Expires 8/20/2015 at 11:59 PM EDT."
So that promo was limited to the first 1,000 orders and they mailed it to me on the 21st while it expired on the 20th.
I'd say if your offer is different, go for it. I thought about calling them about my expired email offer but didn't have a banner that I needed that jumped to mind. Let us know if the order gets processed, if so might think about it again.