I saved up my allowance for 2 months just to buy enough UC to get the Lucky Spin Royale move

https://blogfreely.net/reiddarqfi/using-paypal-and-card-safely-for-pubg-uc-why-manabuy-worked-for-me

I stored up my allowance for two months just to buy ample UC to get the Lucky Spin Royale move, making the grind totally valued at it.