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Because Twitter can drive a lot of traffic to your sites, think hard about how you can use it to help people find good deals you offer. Among the successful tactics companies use:
Promotions. Offer Twitter-specific discount codes. Some companies report that lower-priced items are much more likely to get uptake. Do some testing to see what works for you.
Contests. The Twitterverse has seen a lot of contests. But people do tend to like them, and fun, creative games with good rewards can generate some nice buzz. (If you run a contest, be sure to describe it on your website and include legal details.)
Sale announcements. Let people know when you run a great sale. Or if you run an outlet, post choice new items as they hit your inventory.