There are lots of 28mm lens that go for $100 or less (including the M28/2.8, A28/2.8, and M28/3.5 and of course pretty much an generic brand), I don't know of anything wider that regular goes for that little. I guess the Sigma Superwide 24/2.8 can sometimes go for not much more, and really, the Pentax K24/2.8 isn't all that expensive either - $200 or less.
For 100mm, the M100/2.8 goes for around $100, as does the M100/4 Macro. For 200mm, the M200/4 is pretty much always well below $100, as is the M135/3.5. You didn't mention 15mm specifically, but you did say 100+...
Note some of these lenses are harder to find than others; KEH.com is also a good source for some less-common lenses.
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