Where to buy a Heater Core on the Internet

Can anyone post a link to a site that sells heater cores for a 2000 Cherokee w/ac? Advance Auto Parts ($79.88) and Auto Zone ($67.99) list a #399233 from GDI, but both retailers are sold out. Cheapest Four Season part I could find was $138.79 at Rock Auto. Thanks!

Got one word for yah.....NAPA. Chances are they will be cheaper and better quality. Unfortunately their website is having probs at the moment. If there is a store in your area, give em a call. The web site is www.napaonline.com if they get their issues fixed.

search on eBay I think I saw one for like 50 bucks.

Napa did not have one in their system, but my local store was able to order a Four Season (all copper) core from a parts warehouse in Fredrick MD. $150.
Thanks.