This article below comes from Amazons API documents. Fresh Store Instant & Fresh Store Builder Shopping Cart is coded with the Amazon API. The limits you see below are set by Amazon and not Fresh Store Instant.  Click here to go to amazons documents page, which has the same info as below. 

If you don't want the items below to show on your website. You can disable them from showing by going to your Freshadmin panel and clicking on Tools - Change Parameters - Products Tab. Then look for the "Product Without Offers" parameter and turn it OFF. 

Information below comes directly from Amazon

Product Advertising API operations sometimes return items that cannot be added to the Active cart area. The following sections explain those cases:

• Out of stock items

• Items with limited quantities

• Digital items
 (Kindle ebooks, videos, music, movies, or any items for download)
• Variation parent items

• Collection parent items

Out of Stock Items
Most items for sale are available immediately. There are times, however, when that is not true. Items can go out of stock or very popular items, such as a new Harry Potter book, are pre-sold, that is, the book is sold before the book is even published.
When a customer adds an item to their cart that is not available, it is added to the SavedForLater area. Also, if an item in the cart, for some reason, becomes unavailable, Amazon automatically moves the item in the cart to the SavedForLater items section.
It is also possible for a customer to add an item directly to the SavedForLater items area in their cart so that they can easily purchase the item at a later date.
When items become available, you can use the CartModify operation with the Action parameter to move items from the SaveForLater section of the cart to the Active section, which is fully described in Moving Adding Items as Saved For Later. Or, if Amazon automatically moved an item in the Active area to the SaveForLater area because the item went out of stock, Amazon will move it back into the Active area automatically when it becomes available.

Items With Limited Quantities
Many products have a limit on the quantity that can be added to a cart. Sometimes this is inherent to the product, for example, one-of-a-kind jewelry items. Sometimes it is a limit set by the vendor, for example, they might set a limit for big ticket items of one per customer. If you add an item to the cart with a quantity that exceeds the maximum, CartAdd or CartCreate automatically resets the quantity to the maximum. No error is generated. Therefore, you must verify the quantity of items in the cart with the number ordered to determine if the quantity has been capped. If so, you must notify the customer. 

Digital Items
Digital Items, such as Kindle books, Amazon Instant Video, and MP3 files, can be purchased only by using Amazon 1-click. They cannot be placed in the cart.
• MP3 Music

• Amazon Instant Video

• Kindle Edition

Variation Parents
Variation parent items cannot be added to a cart. For example, you cannot add Apparel to a cart because it is not clear what apparel you really want to buy. You could add one of its children, however, such as a red shirt, size large. If you try to add a parent item, you get an error

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