I think there is no 737/200 Sim in FRA, so it is on a 737/300.
If you wanna do some hours on FullFlight, you can do it in FRA via Lufthansa Training, or Intercockpit for around 500€ p/h
If a Fixed Base is enough for you I suggest you TFC Käufer in Düsseldorf for around 250€ p/h.