almond flourdd

Does anyone know where I can buy almond flour or is this just the same as ground almonds. My eldest lad just been diagnosed type 1 diabetes and we,'re trying to find alternatives to flour but this appears to be non existent although plenty of receipes for its use. Thanks

Thanks,I never thought of Amazon. I knew it would be expensive but right now I just want to be able to make him the occasional healthy treat. I'll be trying coconut flour also and that does be more available and cheaper.