Consequently, why is everything on wish an add on item?
An "Add On Item" is an item that can only be purchased with orders containing at least one non add on item. If you're interested in an item, the product listing will show if that item requires other Add On Items to be in your shopping cart before you may purchase it.
Additionally, how do I buy an add on item on Amazon without the 25 minimum? To bypass the minimum, all you have to do is purchase the add-on item, go to the checkout screen, and switch your account to Amazon Day shipping. For example, as Dan's Deals points out, this box of band-aids only costs $2.19—but it's an add-on item.
Correspondingly, what does an add on item mean?
Add-on items are low priced items that would be too cost-prohibitive to ship on their own. They can be purchased as part of orders containing minimum $25 of items shipped by Amazon. See Amazon.com Help: Buy Add-on Items for complete details.
Can I add an add on item to existing order?
In some markets, you can add products as long as the order hasn't yet been processed. Go to the Amazon Fresh website, choose the items you want to add and select Add to Fresh Order. In some cases, you may want to cancel your order altogether. This option is only available for items that haven't yet shipped.