The Problem
As much as I would prefer to buy locally, it is not always possible. The common alternative is to buy from Amazon on-line but then you need to get the products through customs and to you. There are companies (TransExpress, for example) who offer you an "address" in Miami Florida where they will receive your shipments, ship them to Guatemala, get them cleared by customs and delivered to you. That's the good news.
The bad news is that companies that sell on-line and Amazon in particular tend to divide up your order into multiple shipments. So, you may place an order for 10 items totalling $500 and it could get shipped in up to 10 packages. The freight forwarder then receives 10 shipments and charges you to process each one individually. Besides the additional shipping and processing costs, you will need to break up the original order information so the forwarder has individual bills for each package.
Solutions That Don't Work
There may be more than one but I only know about Guatemala Digital. In theory they are what is needed. Clearly most if not all of their product comes from Amazon. You just go to their web site, order what you want and they do the rest. Unfortunately, their implementation falls way short of what is needed. Here are some points:
I could continue but the bottom line is that you can easily spend more time ordering two items from Guatemala Digital than you would spend ordering 20 from Amazon. I would summarize this by saying they have implemented the wrong half of a solution.
The Solution
In summary, you need a Guatemala-based business who will buy what you tell them (and this could be restricted to Amazon -- at least initially) and they get it to you.
Here is what I see as the way to do it:
Clearly the company will need a warehouse with staff in the U.S. to handle the consolidation but it is very likely there are shipping companies they could work with.
None of this is hard. All the computer stuff can be easily implemented using Open Source software. There is no product files to manage and update -- only order-specific information.
What is needed:
That's about it. Anyone ready to do it?
Note 1: This interface could be "improved". I think the best approach would be to offer the ability to add individual items like this: