Best Buy has the best in store selection and prices (especially on the Harrison "Live in Japan"!). Circuit City doesn't keep much of an inventory in store (at least in Orlando area), but their website carries a ton of SACD at decent prices.
We have a Virgin Megastore here that sells SACD and DVD-A, but they are starting to suck when it comes to getting new releases and keeping up with stock. I no longer go to them.
Happy Hunting!!
ICK