My most successful sourdough starter is called Myrtle, don't ask me why. Our little sourdough babies, 250g, are only fed organic flour. They will have been fed 2 days before you get them and should therefore be bubbling and ready for use.
If you're are buying this as a gift, or just fancy it in a pretty jar, I can pop her in a 0.5L kilner jar for you. Otherwise you will receive this in a clear plastic lidded jar for you to transport home.