Few years ago I made my own hooks for free by just cutting old golf clubs and by combing them with metal pieces that I bent beforehand. Below are pictures of the resulting hooks:
I used them for lifting up cobras and rattlesnakes and they worked perfectly fine. However, when it comes to herping trips, I would never bring them with me because:
1) They are quite long and it is not convenient to fit them in a luggage (assuming that a flight is involved)
2) In Europe, I don't really see the necessity of working with a hook (an exception could be for Macrovipera sp.), even more if one focuses on "in situ" pics.
3) If needed, a simple wood stick is working pretty well for many species.
4) As mentioned by Michal, hiking with a hook can be suspicious for rangers and co. For instance, I was already told that you can be fined in the Everglades NP by just carrying a hook (or snake gloves, tweezers, ...). Maybe people in this forum will share equally bad experiences in other countries (Israel?).
For all these reasons, I leave my hooks at home