This site is being deprecated.
Please see the official X‑Plane Support page for help.
I am not with Laminar Research; just a flight simmer with no connection with any organisation or product mentioned previously or hereafter.
You are on the wrong website. Laminar Research is only the developer and seller of the software (X-Plane) that your nephew has already. They are not the reseller of any third party products.
However there is another 3rd party reseller of many items marketed for x-plane use only that has an extremely similar name website to X-Plane.com This site will definately solve your problem. I understand if you act quickly (this weekend) you may get some good deals. Have a look at https://store.x-plane.org/ and then click on the appropriate tab at the top of the page.
This site is no longer being actively maintained.