Yeah, but you need to know where to buy it, how to get it delivered etc. Getting a Gameboy Advance cable in Denmark is $18.5 and delivery might take a week or so.
Anyway, the exact charger for a GameBoy Colour doesn't exist as the GBC takes AA batteries and can't charge them even if you connect the power brick to it.
Someone's trying to talk about stuff they never used, experienced or googled ever.
But yeah game boy advance cable is $2.5 one day delivery here in Poland