This method might already be out there and is quite basic; I did a quick search and didn’t find anything.
1. Buy or level up an account to level 10 in any of the regions of your choice that provide cheaper RP options ( turkey should be cheapest but any region would work, Philippines, ect. )
2. Buy the RP on your alt account for a significant cheaper price most of these regions accept Visa / Mastercard. ( you might need to use a residential proxy or VPN on this step if the payment doesn’t want to go through )
3. After you’ll be region changing your account to the desired region where you want the gift(s) to go. So if it’s NA move your dummy account to NA or EUW.
4. Enjoy
ps. please be aware that currently account transferring is down this is why many stores are having issues providing you the bigger collection for money.
You can use this on your personal account but I haven't tested this and you'll have to transfer region twice.