Hope this list and links can help you. If you or anyone else know any other places, please, let me know

Barnes & Noble (SACD 1,788 / DVD-A 220
http://productsearch.barnesandnoble.com/...0&AREF=1528
Borders
http://www.borders.com/online/store/SearchResults?keyword=SACD&type=2&simple=1
CD Universe
http://www.cduniverse.com/browsecat.asp?style=music&cat=2703
Chesky Records
http://www.chesky.com/
Deep Discount
http://www.deepdiscount.com/index.cfm/fuseaction/search.results?Ntk=music&Ntt=SACD&N=1985
Elusive Disc
http://www.elusivedisc.com/searchprods.asp