Amazon.com has Black Friday deals on CD's until 12/1 prices as low as 2 for $10.00.
2 for $10.00 has many AC/DC, Steely Dan, Springsteen, Boston, Tom Waits, Miles Davis titles as well as Cream, Traffic, ELO, and a lot of Greatest Hits.
They have better stuff 2 for $16.00 and deals on box sets. Fill in your gaps for cheap or get started building your Classic Rock for you youngings