1. Library: You can go to the local public library to check if there is a compressed version of this dictionary. There are often collections of ancient Chinese dictionaries in the reference books of the library or in the ancient books area of China. You can consult the library staff to borrow or copy relevant content.
2. Online Bookstore: You can search online bookstores. For example, Dangdang, JD.COM and some second-hand book trading platforms sell this dictionary, and you can get this dictionary through online purchase channels.
3. Ancient Books Bookstore: You can try to find some bookstores that specialize in selling ancient books. These bookstores usually have a comprehensive dictionary of ancient Chinese. You can contact these bookstores and ask if there is a second edition of the Dictionary of Ancient Chinese for Primary Schools.
It should be noted that this dictionary is published by Education Press, so you can also try to contact Education Press and its branches to ask if there are any sales channels for this dictionary. I hope I can help you!