Well since you have no interest in changing your mind might I suggest a SINGLE betta? I would add some plants for looks and security purposes and try to get a small sponge filter for the tank if at all possible.
...like I said, I wouldn't subject my fish to a 2 gallon tank. A 10 gallon can sometimes cost less than all the extra crap you need for a smaller tank and its really less stressful. Tell me, why can't you get a 8,10,12 gallon eclipse system for the office?