Hello. I know opencart, I installed it many times. I can do this in couple of minutes... then I can also design it for you and add more functionalities for you in minutes... Dont know how many is R$95, but I can install opencart and add template for US 30$ or 25€.
And then I can also upgrade it for you in future if u need that for fair price. Probably you do, everybody does :)
Best Regards and a nice day to you!
Dule