At first glance 2000 frames seems like a window-shopper's dream. Sadly many of those frames are simply the same one offered in multiple colors (and thus listed multiple times: once for each color). This actually makes the browsing experience a little more frustrating for some.
The good news? Goggles4u has a heavy emphasis on frames for under $10. Almost half the frames fit into that category. In other words: this is not one of the places where you get a really small selection of "cheap" frames with the intent being to up-sell/bait-and-switch you. They're completely oriented towards the budget glasses market.
The frames themselves start at $0: a great price at first glance. That does not include lenses though; basic lenses add $6.94. If you're unlucky enough to hit a time when they do not have $0 frames (they tend to change their pricing around regularly), you might be looking at up to $5 more. Either way it's almost always possible to get something shipped to your door for somewhere between $10-20 all-told. And that's not bad.Goggles4u website
With over 2000 frame ranging from $6.95-45.95: Zenni has a selection for numerous price points in the budget range.
Realistically you're looking at about 50 frames in the <$10 range and 300-400 in the <$20 range whether browsing the Men's or Women's categories. Kids frames have a lower selection (about 1/5 of the offerings of either adult selection at any price point).
The frames are often offered in more than 1 color and do come with free single-vision lenses. Generally speaking: Zenni keeps a healthy selection for every price point.Zenni Optical website
About 50 frames under $10 can be found with a few hundred more in the under-$20 range. They do list duplicates when multiple colors are available but when you choose a frame you can often select the alternate colors that way as well. They top out at just under $50.
Single vision lenses come free with the frames.EyeBuyDirect website
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Some data might be wrong on this site. Do not take it at face value. Do your own research to verify the claims here.