In almost all cases, the potential to damage a material (a particular type of plastic, or a paint, etc.) with any particular liquid solvent depends on the chemical interactions of the two materials. Ethanol and iso-propanol are two VERY closely realated solvents that have VERY similar interactions with other materials. So if the plastic insulation of an electrical cord can stand up to iso-propanol, it certainly can stand up to ethanol as well.
In fact, the reason that iso-propanol is so widely used for this purpose is somewhat the opposite of what you have found in trying to buy stuff. In many countries distribution of ethanol is restricted because of possible abuse by drinking it - it is the only alcohol that humans can drink without being severely poisoned. But also for that reason, it IS used in products that are designed to be used on your face, like cleaning wipes. So for that type of product, the solvent in the wipes often is ethanol with some water, plus a trace of a third chemical which has a terrible taste, to discourage people from trying to drink it. But for other cleaning uses, and even for simple disinfection of a small skin abrasion, the common solvent is iso-propanol which does the job at a cheap cost, but is NOT likely to be consumed by anyone since it is poisonous to drink. Because it is more widely used, iso-propanol very often is easy to get a low prices. It is more commonly called "Rubbing Alcohol".