Amazon orders can be picked up at local Post Offices and some shops in Northern Ireland. As a few examples: both Derry and Newry have 20 locations were you can get your Amazon order sent to. You then go and collect the item. The service is called Amazon Hub.
If you are going to be in Northern Ireland in the coming weeks you could avail of this offer which gives you £7 off your first Amazon hub order. The items have to be dispatched and sold by Amazon (more on this below)/
To get order:
1) click on this link to go to Amazon to activate the order.
2) add the pick location. List of locations is here. Type in the town you intend picking it up in. Adding a location adds it your list of delivery address(es)
3) decide on what to buy and add them to your cart. When you are in the product page for each item, underneath the 'buy now' button you can see if Amazon dispatch & sell the item. Sometimes these can be third party sellers which don't qualify for the offer.
4) when you're ready to complete the purchase, at checkout change delivery address to your pickup location. You should see the £7 reduction.
Example of where you can see that Amazon dispatch & sold item:
Example of where you can see your pick-up location after you've added one. It's directly below your usual delivery address(es)