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amazon.com/ --> Kitchen, then search 4 for 3.

many items also PRIME eligible

i.e.
Silpat 11-5/8-by-16-1/2-Inch Nonstick Silicone Baking Mat
Buy new: $24.99 $15.98

Buy 4 Items for the Price of 3

To take advantage of this 4-for-3 promotion, follow these steps:

Add at least 4 eligible items to your Shopping Cart. Eligible items will have a message such as "This item is eligible for our 4-for-3 promotion." on the product detail page. Eligible products include select books, single-copy magazines, and Home & Garden items. You may include items from different product categories in a single order to qualify--for example, you can order an eligible book, an eligible magazine, and an eligible kitchen item.
Proceed to checkout. When you're done shopping on our site, click the "Proceed to checkout" button in the Shopping Cart. Your shopping cart should include at least four qualifying items during the checkout process to qualify for this promotion. Additional conditions are listed below.
On the final checkout page, we will discount the lowest-priced item. A promotion credit for the amount of the lowest-priced item will appear in the upper right corner of your Order Summary during the checkout process. If you use 1-click ordering, the promotion will be automatically applied.

Terms and Conditions

Items eligible for this promotion will vary over time. Items placed in the Shopping Cart overnight may not be eligible for promotion at time of checkout.
Promotional offer applies only to qualifying items displaying the offer message on their product detail pages. Items that do not display the offer message do not qualify, regardless of the nature of the items. Items from different product lines may be used to qualify for the promotion, as long as each individual item is eligible.
Applies only to products sold by Amazon.com. Items offered by other merchants on the Amazon.com Web site (e.g. Land's End, Target, etc.) do not qualify. Does not apply to any products purchased in Amazon.com's other sites, including Amazon.co.uk, Amazon.de, Amazon.fr, or Amazon.co.jp, or in Marketplace, zShops, or Auctions.
Unless the offer message indicates otherwise, the promotional offer applies to the lowest priced qualifying item(s).
Applies only when all qualifying and free products in the promotion are purchased in one order.
Applies only to complete orders shipping to a single address that meet all other promotional requirements.
Offer good while supplies last.
No substitutions or rain checks.
Shipping and handling charges apply to all products, including bonus items.
Offer may not be combined with other offers, including promotional certificates.
Void where prohibited.

Oxo Good Grips Professional 6-1/2-Inch Santoku Knife
Buy new: $22.50 $19.99

Pyrex Storage 10-Piece Set, Clear with Blue Lids
Buy new: $19.99 $14.99

etc

go to the 4-for-3 home page to find other eligible items.
http://www.amazon.com/Promotional-Items/b/ref=amb_link_3350262_3...