There are many good options for Internet or Sim-cards.

• For internet services, you can always find the possible internet speed in your area of residence on the official websites of providers.
• Contract can vary from type and provider, so you can choose what best suits your needs. You can check the best options on Check24.
• Some provider offer contract for sims along with cellphone and other gadgets. If you are also looking for a new cellphone, this might interest you.
• If you are interested in purchasing a laptops or related devices, you can try
  • Saturn
  • Notebooks Billiger
  • Media Markt
  • Alternate
  • Cyber Port
• You can also find more shopping details Click To View Shopping links.

You can try following Apps/Websites, ofcourse these aren't all & the list goes on...