I am not a fan of mixed pairs. For two reasons, they don't look natural to me and as they get older and start thinking about breeding, they tend not to give each other the correct "clues" and fighting/killing breaks out.
Don't let the LFS try to say you have to buy the pair. Inter-species pairs are very rare in the wild. The orange skunk is not big enough to be a breeding female, so they weren't captured as a breeding pair in the wild, so therefore they are not a pair even if they were captured in the same anemone, which is also unlikely since they prefer different types of anemones. I have had two breeding pairs of orange skunks. One of which went from a breeding male to a breeding female in my care. Orange skunks need to get bigger than 3" before they lay eggs.
Orange skunks are not very rare, they just aren't very popular. I don't know why, I love them, but one clutch of babies would pretty much flood the market around here (which is why I don't raise them anymore). If you ask around you can probably get someone to pick up a little one to go with the larger one if you are patient.