Hello,
Possibly you can get a US plug for the power supply you already have.
For this power supply the US plug is called “Sunny SYS1460-AC-PLUG-W2”
Otherwise if you have this PSU, the US plug is called “Meanwell AC-PLUG-US4”.
I can also ship one of these plugs to you at shipping cost, but perhaps it is cheaper for you if you can find them in a (web)shop in your country?