Way i have done in the past as well as for vendors, is to figure out in the situation how many magical items are gonna be found or given and then roll ahead of time. This way can also help flesh out the game by giving u ideas because many times i have rolled loot and saw loot that players if found would just sell off so instead gave them to bad guys and had the bad guys use it. Or something nice and threw it at the end for the prize to be gotten. But most of the "mundane" magical items ive given to npcs or enemies and had them use it. Its fun for us the GM and also gives the player a reason to want such an item when normally they woulda passed it up and forgot about it.
I roll a % die and see what it is and then go to that section and determine if its minor major etc and roll again. If its armor ill go to armor section and roll to see what type (l, m, h) and then roll a d6 and have 1 &2 be light and so on and then once thats determined then i see how many there are in that section and roll a die thats equavalent to it and if the number doesnt match up ill pass up the lower ones up top til i the number up top goes all the way to bottom and presto the armor is done.
may seen daunting but it literally takes a few minutes and its quite fun because of the randomization. For a single player id do one from each section and not do 2 from the same (ex. Dont do 2 head pieces etc).