4.0" x 4.5" Tube

Q: for the bird tube 4 x 4.5 with 3/16" wall, how do i select which color i want? it appears to come in either purple or pink but doesn't give an option to enter in how many pink and how many purple tubes i want. Also I live in fremont california 34571 wells ave 94555 and was wondering what the total cost would be for 12 tubes? I'll wait patiently for your reply. Thank you!