I think this ends today, but the entire X-Men by Chris Claremont and Jim Lee is available for 99 cents per issue.
This is Uncanny X-Men 244-280, X-Factor 60-70, and New Mutants 95-97, X-Men (v2) 1-11, along with a handful of extras (some Ghost Rider crossover issues, some Classic X-Men, etc.).
If you were buying this in print, it would be both "Uncanny X-Men by Chris Claremont and Jim Lee" omnibuses and the X-Tinction Agenda OHC.
I...I bought most of it.