ReeMoo 200PCS Fishing Barrel Swivel with Safety Snap Connector
★★★★★ (4.6/5) from 700+ reviews.
With only a small price, you'll get a lot of swivels that could be a lifetime supply. They are not silver as they appear in the photo, more like a cross between silver and dark gray. They came with various sizes that should work for everything, and also with good quality that's really worth the price. They are durable, easy to tie on and came with a sturdy case.
But of course it also has some flaws, considering how cheap these are. The sheet metal used for the snap is extremely prone to bending and the swivels are very prone to rusting, might be a one time use item in saltwater. Make sure to keep them in a dry place, just bring enough when you go fishing and leave the rest at home.
Even though they're not as sturdy as other famous brand, the price is far less than average, considering the amount of swivels you'll get.