Hakata Ikkousha's original-froth tonkotsu under 1,200 yen with kaedama refill. Five minutes from Hakata Station; cheaper than Ippudo, same bracket as Issou.
Nagahama Number One Gion pours Hakata tonkotsu at 700 yen near Gion subway. The cheapest seriously-good ramen in Hakata, with a 20-hour pork bone broth.
Try: Hakata tonkotsu ramen
Tip: Cash and IC accepted. Kaedama refill is 150 yen.
Daichi no Udon goboten udon piles burdock tempura on a soft Hakata noodle bowl. Hakata Station B2 branch is the cheapest counter for a serious udon bowl.
Try: Goboten udon
Tip: Open from 10:00. Add a small bowl of rice for the broth soak.