If you haven't been to JRM in the past 3 weeks, you should definitely plan to spend more time there. The reason is the estate sale, which has been mentioned other places on this board. The tables are still groaning under 1000s of used CDs from the estate of a serious collector. There are many Mosaics still available, too. Also, the guy liked classical. So, there's 3-4 tables in the back that are packed with classical cds.
They're all used, so prices are below retail. Lots of good stuff still available.
If you have been to the JRM recently, then Reckless is good. You can also head west on Belmont and hit Record Exchange, just before the El stop.
Have fun. Stay warm.