For folks in Australia and NZ , for non RGB lights , many of us buy the normal 8 function fairy lights (LED) ie the ones that are 150, 200 , 600 in length. Often referred to on the forums as the 'BigW' lights because of the store name, but available from many stores end Aug to December.
These are A/c lights , but we cut off the controller , chuck the A/C plug away into a box and then use the LED lights via a Ray Wu 27 channel controller or other locally made boards (and a 27 to 30 V PSU).
You can cut these LED strings into shorter lengths as every 8 to 9 form a circuit. You can mix and match diff colours and use the On or ramp effect to turn them on.