If it is a good version, it must be the kind of vertical index in the traditional way of Shanghai Ancient Books Publishing House, but it is more expensive. Compared with major online bookstores, Dangdang is the cheapest, and 67 yuan is required.
There is also a traditional vertical edition of Zhongzhou ancient books, photocopied by 1933 Commercial Press. It's very cheap, but it seems that it can only be bought through Confucius' old book network, which is worth recommending.