Triacs,Arduino,High voltage and a novice user

My project is a bit limited by size.I must fit everything in a small enclosure plus i can;t find any small transformers to fit my application.Any pointers towards where i can find any small sized 240V to 24V (can be a bit more than that,will feed it in to a resistor network to adjust the voltage levels) transformer?!One that is able to sustain about 2 amps?!