If you are looking for a source dbol or other steroids, check the source reviews section on the board here. I know the approved source Roid Mass ships internationally ->
https://www.roidmass.com/?tracking=56c1c38261f70
4 weeks is a very short amount of time. Building muscle is a slow process. If you are going to do a cycle, you might as well do it right. I would do a 8 week cycle.
The gains from a dbol only steroid cycle won't be quite as good as you would get with an injectable cycle but you can make very good gains, and keep them with a proper cycle lay out and PCT.
I explain how to properly run a dbol only steroid cycle in this video here ->
https://www.youtube.com/watch?v=5DBrylerLxA
It looks something like this -
Weeks 1 - 8
Dbol or Tbol 50mg/day
Aromasin 10mg every other day or arimidex 0.5mg every other day
A good natural liver aid supplement like N2guard - 1 serving/day
A good natural testosterone booster like HCGenerate - 1 serving/day
Followed by a mini PCT to restore natural testosterone production.
4 weeks of the following:
clomid at 25mg/day
nolvadex at 20mg/day
A good natural liver aid supplement like N2guard - 1 serving/day
A good natural testosterone booster like HCGenerate ES - 1 serving/day