SALE ALERT! Odyssey Music Store. Not sure if this covers all branches but I stumbled across the sale at its SM Sta. Mesa branch.
CD's for 99 Pesos! Selections include Radiohead, Pat Benetar, Human League, Moby, Joss Stone, Depeche Mode, Paula Abdul, Blue, Frank Sinatra, Nat King Cole, Elvis Presley, Blondie, Go West, Grammy Awards compilation, various original artists compilation CD's and plenty more I can't recall anymore.
I picked up Dave Koz, Duran Duran and Classical 2012 (classical music by various classical musicians - 2 CD set). All for 297 Pesos.
CD's for 150! Morrisey - The Best of Morrisey CD and DVD set. And a 3 CD set of 60's original compilation CD. Michael Jackson Off The Wall, Dangerous, Bad.
CD's for 250. The Essential Billy Joel, Beyonce and many others I can't recall anymore.
Don't bother with those CD's on sale priced at 50 and 75 Pesos.