Be aware of toy radios that come with toy planes and cars though (the ones that are available in supermarkets etc).
Just to elaborate what Anwar bhai wants to emphasize. These Toy RC radio are not proportional one, beside being 3 channel most of time. This means, when you move the sticks, you would be either Turning 'Off' or 'On' and and not a linear/digital value of -255 to +255.