mean well gs40a15-p1j: 40 watt ac-dc power supply price : $25.00

40 watt ac-dc power supply with universal ac input range

built-in active pfc (power factor correction) function, pf>0.91 (green initiative for highest efficiency and minimum line-induced noise)

protection from short circuit/overload/overvoltage/ over temperature

2 year warranty

uses 2.1mm x 5.5mm barrel connector

this is the recommended psu for the tps30w

download the data sheet here.