I own a few, but can't say that I'm collecting them. In fact, the only modern bullion that I keep track of are Britannias (love the design).
If you are interested in putting together a set of Libertads, though, you might want to get a Dansco album # 7232, which is made specifically for them.
Looking at ebay's completed items - it appears most Onzas sell for 11-15 dollars each (plus shipping). Make sure you look under "Coins - Bullion - Silver" category.
There are several different versions of the onza from 1/20 oz. all the way to 5 oz. You should be able to find something to fit your price range with all the different weights. Mintage numbers vary by date from a few hundred to over a million. Lower mintage numbers are usually proof issues.
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