I am happy so far with YaySave.
I just received a "mystery Code" that ended up being worth $1.50!

Another cool thing I don't think I mentioned is that they give free shipping on any order size & they do a price comparison for you.  Gotta love shipping right to your door (and FREE!)  I think you have to be a member to get the free shipping, but if you have the points from swagbucks it would technically make it a free membership ;)
Free shipping on orders $59.00 & up (up to 60 pounds)  use code SHIPNOW

Ends 2/12/12

(See my post in BZZZZZ Section for more information on this company)

I just signed up for shoprunner - I have been told it is a great way to save on shipping, so let's find out :)
PetSmart, Babies R Us, Toys R Us, and many others are included in the list of ship for free & return for free!

There is a members benefit section that gives addition discounts.

& another bonus??  Yup - you can use this in combination with ebates.

It's worth checking out and seeing if it will work for you.