The amp will draw whatever amount current it needs. You should look a wall wart with high current rating-1A. It's more current than the meta requires, but I think a higher current rated ps, lends a greater sense of ease to the sound.
Generally anything over 60-100mA will work fine. You can't really have too much current, since the amp determines how much current is used, the power supply will only ever supply as much current as the amp needs, unless the amp asks for more current than the power supply can give.
It was on ebay. Unfortunately, I didn't get any information till the auction over, so, I don't have it now. sorry. I think it a Acopian linear regulated 24v power supply(Gold). The item number may be : A24H1200