Amazon.com has free Prime trial memberships for parents called Amazon Mom. Its basically free shipping on almost everything on the site (just look for the "Prime" logo on the item description page), no minimum purchase required.
The Old Navy near me had an additional 50% off their clearance clothing when we were there yesterday. Not sure how long this will be going on for. I saw some adult winter coats that would have been $10 each.
The drugstores often have stuff like toothpaste, toothbrushes, cold/flu medicines (including some natural ones), body washes, etc really cheap or free after rebate/coupons. Check out www.southernsavers.com
for a list of things by store and where to find the coupons. A basket of body washes and stuff might be nice for a mom.
Rite Aid has NYC cosmetics free after their UP reward (like CVS's Extra Care Bucks or Walgreens' Register Rewards) this week (10/24-10/30). Buy a NYC cosmetic product for $1.99, get nail polish free. You'll get back 2 $1.00 UP rewards to use on your next purchase. Might be a nice gift for a teenage girl. (Or the moms, who I'm sure do without a lot of stuff and who also like to look pretty.)
has coupons for $1.00 off any 1 NYC color cosmetic product, making these better than free!