I don't think they are zebras, they are one of the many new replacements currently on the market the replace the Zebras. A true Zebra Hypancitrus Zebra, L046, will go for a minimum of US$200. If you have a pic or Latin name that would help.
There have been some zebras that have a brownish tint to them. they are not the Real L46!!! Check em out and if they are totally white and black buy em all!!!! I'll take one for $75 too!