So I found this on the "Texas Administrative Code" website (Title 22, Part 9, Chapter 165):

"(2) Electronic Format. (A) The physician responding to a request for such information to be provided in electronic format shall be entitled to receive a reasonable, cost-based fee for providing the requested information in electronic format. (B) A reasonable fee for providing the requested records in electronic format shall be a charge of no more than: $25 for 500 pages or less; $50 for more than 500 pages."

Both requests ended up being around 250 pages (in electronic format) so hopefully if I am charged it won't be more than $50

https://texreg.sos.state.tx.us/public/readtac$ext.TacPage?sl=R&app=9&p_dir=&p_rloc=&p_tloc=&p_ploc=&pg=1&p_tac=&ti=22&pt=9&ch=165&rl=2