Michael, good evening!
OneBox will provide you with OneBox OS cloud software free of charge for any period and for any number of users. Free and forever.
You can also choose an integrator here -
https://1b.app/en/partner/search/Unfortunately, we cannot cover the costs of integrators, as this is not our business. But I know that many integrators help volunteers and set up boxes for free. With your permission, I will pass on your contacts to several integrators who fine-tuned the bundle with the cart that you wrote about in this thread.