Harbor Freight is probably the most convenient for those in the USA (look at the coupons for sales), but any auto parts shop should have similar ones, and I also use nitrile exam gloves from Costco. Back in the pandemic, there were stories of shady suppliers shipping out USED gloves...

All of the thin ones (exam/5mil etc) will tear, but they are cheap and usually help keep your hands pretty clean and protect a bit against cuts doing light work. I also keep some 7 mil around as well as the cheap ones for heavier work, like the car.