FYI – We received the following email from Amazon Product Ads yesterday.

Minimum Bid Increases on August 27, 2013

Dear Advertiser,

On August 27, 2013, Amazon Product Ads will be increasing the minimum bids in 60 bidding categories. We will not be changing the minimum bids in the remaining 114 categories.

In the 60 impacted bidding categories, we will automatically set your category-level bids to the new minimums. We will do this for your category-level bids that are at or above the current minimums and below the new minimums. We will not change your category-level bids that are above the new minimums or SKU-level bids that you have set using your product feed. You should review and update all SKU-level bids in the impacted categories before August 27, 2013.

If you do not want us to set your category-level bids to the new minimums, you can opt out of this change in Seller Central. Just look for the “Minimum Bid Increases on August 27, 2013” notice at the top of any page.

Ads for products in the impacted categories will not be eligible for impressions as of August 27, 2013, if you opted out of automatic bid adjustment and your category-level or SKU-level bids are below the new minimums.

Please review the Setting Bids help page or contact our Seller Support team if you have any questions about adjustments to the minimum bids.

Thank you,
Amazon Product Ads