Does anyone know where I can get replacement cupholders or coaster studios?

Your dealer should have no problem doing so. Sometimes it takes a while since the parts usually come out of LA, and they seem to take their time with things. Are your chairs still under warranty?

Well I drilled a large hole in the center cupholder to hide wires to mount a touchscreen for the theater, I just want a backup in case I go with something wireless in the future.