If you are talking about replacement charger, YES.
If you are talking about cloned, you must be kidding

I guess, 99% of the Magasafe Adaptor selling in eBay, specially those from China are cloned. The distribution price is about US$10, and they are selling it for US$30-40.
The cloned is just like the original. You need an expert tell the different!
Don't forget, all Apple's products are MIC