They have been found Rite Aid and Walgreens and other drug stores. Some have even been found marked down on clearance. They cost about $10 for a box of 3, or $20 for a box of six. Also look at flea markets. If you can find any, buy them and sell in a lot. Here are some recent completed listings:
Today Sponge Vaginal Contraceptive Box of 6 2010
That's right! One box of 6 sponges that costs $20 sold for $99!
6 ~ TODAY SPONGE Contraceptive New in Box Exp 6/10
Same thing, a $20 item sold for $99.95!
3 ~ TODAY SPONGE Contraceptive Exp 6/10 New in Box
Box of 3 sponges which cost $10 (or less) sold for $49.95.
Let me warn you, these are hard to come buy. But it never hurts to look if you are out and about and can drop by a drugstore and check. If you do decide to sell them, list them as a private listing. You will get more bids and buyers if the buyer's privacy is respected, because of the nature of the product. Click here for step by step instructions on how to create a private listing.
I had great luck with these last summer and fall, and have cleaned out most of the stores in Atlanta! Other sellers in my Facebook group reported finding the Today Sponges and making several hundred dollars.
Update September 2013: Since this post was written in 2009, I have become proficient in selling grocery items on Amazon, including "embarrassing products" like contraceptives. Personal items sell better online than in retail stores because of the privacy of buying online. In fact, I make between $150 - $200 selling condoms on Amazon every month. Learn more about selling grocery items by taking my class, "The ABCs of Selling Groceries on Amazon."
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