Red cap, Pink cap. Is there a difference? I have seen many blue caps advertised but never a yellow cap. are they even harder to get than red or blue? AND why not any GREEN caps? Or metallic gold or silver. Wouldn't that be neat? They wouldn't be opaque but you could put them in clear caps for display. Wouldn't a gold or silver mystery strike popping out of the machine be exciting? If anyone has a yellow cap or blue cap to sell to a new member let me know. CHEAP of course. I am usually financially embarrassed.