The recommended source to buy a supported robot is wherever it is cheapest. After rooting, you won’t have any warranty anyways, which is why buying local usually doesn’t offer any benefits apart from higher prices.
In general, when buying something, you should always use price comparison websites, shopping communities, check Aliexpress etc.
It has come to my attention that there are other people trying to make money off Valetudo by using it to get people to click on their affiliate links. Therefore, I’ve decided to have my own affiliate links. I’m not exactly happy with this, however if people want to use such things, they should at least use them in a way where the money ends up supporting the project.
If Amazon is something that you like to use, here are some affiliate links for it: