The cartoon you are referring to is likely "Teen Titans," in which a group of teenage superheroes can transform into robots during battle. They use their unique powers and abilities to protect their city from various villains and threats.
There are many stores that sell cartoon robots. Toys"R"Us and Walmart are a couple of the many stores that sell cartoon robot characters. Toys"R"Us sells most of these robots for $20.
Transformers
probably Go-Bots
medabots
in transformers cybertron robots in disguise it was hotshot
Dora the explorer
Grape Ape!!
the bratz are not a cartoon because the are like for teens and kids
Robostory
I will turn 100 and there will be robots
megas xlr awesome show
It was the Zoids series.