She really wouldn't have to know and this is how you do the 'trick'...
First of all make sure that she wouldn't want to return it. Then, since it will already be opened or have cheaper wrap on it don't wrap it or give her the box. Have the first disc in the DVD player. Then just say that you want to watch a movie. Push play and surprise it's Sex and the City. Then you can give her a kiss and all is done.
I typically don't ask where my gifts come from and she probably won't either. Then she'll also think that you spent the $60+ on the gift. Deceitful, probably, but she'll be happy, you'll be happy, and no one will be the wiser. You aren't lying just leaving out details. Plus, it's the thought that counts, not the price.
Good luck.
