i very much doubt "Alice" is an individual.
the sm ps units i linked are good, o/p v adjustment is fiddly. i cannot vouch for every-thing else
there are multitudes of cheap sm power modules on ebay,amazon,aliexpreess,....
i pick ones to suit project re i/p o/p power.
if the price is too good to be true , it probably is.
i use R-78E-0.5 for pic mcu mission critical jobs , not cheap but super reliable and tough