You can buy a full length one. Chop it into 1/3 and 2/3. Travel with the 1/3 and use the 2/3 at home (or where you have most room).
A lot of people make the mistake of rolling back and forth alot on foam rollers. That isn't how they work. The stretching part comes about by finding the "tightest" spot and holding there for 20-30 seconds (more sometimes) until you feel a relaxation. The process is called autogenic inhibition - basically fooling the tight muscle into relaxing by exciting the GTO (Golgi tendon organ). This is why it is stretching (through self myofascial release) and not massge (which is what the stick is).