You could buy it in bookstores in the past, but it seems that you can’t buy it now.
Just search for "Lawyer Luo Wenfang" online and see if Teacher Luo has any copybooks like that.
The "Southwest Hard Pen Calligraphy School" which used to be very famous in Chengdu, Sichuan, now has no enrollment. Most of the previous teachers have changed careers. The former principal of the school, Mr. Lu Fang, is now a deputy chief lawyer in Chengdu, that is, "Lawyer Luo Wenfang". Lawyer Luo Wenfang's name can be searched on the Internet; Mr. Zhang Ping is engaged in real estate in Chengdu; Mr. Wang Zhou is engaged in culture Media business; Teacher Chen Huijian went to Yangzhou, Jiangsu Province; Teacher Wu Honghua seems to be still in Chengdu; Teacher Li Fucheng went to Wenzhou, Zhejiang Province to teach calligraphy; Teacher Chen Jinpan went to Chongqing High Real Estate; other teachers are not very clear...
The Southwest Hard Pen Calligraphy School later compiled a series of hard pen calligraphy copybooks, which are now available in some bookstores.
There is "Copybook for Practical Practice of Hard-tipped Pen Calligraphy" written by the principal of Southwest Hard-tipped Pen Calligraphy School Lu Fang published by the University of Electronic Science and Technology of China;
"Fountain Pen Regular Script" of Southwest Hard-tipped Pen Calligraphy School published by Sichuan Dictionary Publishing House "Learning Copybook";
"Hard-tipped Calligraphy Standard Copybook" compiled by Lu Fang of Southwest Hard-tipped Calligraphy School published by Sichuan University Press, etc.
For specific details, you can search for "Teacher Luo Wenfang". He is actually "Lawyer Luo Wenfang" now...