Don't be too surprised Caudia,even when I went to buy Harmony 3 years ago on May 11th,they only stocked about 5 copies.
Along with Bill's answer,it's also tougher to find because it's a 3 year old CD and it's by an artist that most people almost never think about.
Big chain record stores are suffering anyway because of digital downloadig and I-pods. So,when they sell out of something,that mroe than likely took a long time to sell,they're certainly in no hurry to restock it.
If you have independent and/or "used" record stores in your town,I highly reccomend it. Just check your yellow pages under "compact discs".
(They don't call them record stores anymore).
Good luck,Claudia.