http://www.iherb.com/Search.aspx?kw=diva%20cup
The total cost including shipping is $21.43. That is after the coupon code and including shipping. If you have found a lower price WITH shipping, post it here.
Prices at other stores seem to range around $24-25. Also, if you order other stuff at iherb (they carry all kinds of natural brands for health care, beauty, etc) they have $4 flat rate shipping.