Update: Amazon has now sold out of the 21.5-inch iMac, but AppleInsider partner B&H does still have the $1,499 model in stock, as can be seen in the Mac Price Guide below. We'll update readers if more inventory becomes available.
The Apple Authorized Reseller tells AppleInsider that it's currently shipping out both the 2.7GHz 21.5-inch iMac (MD093LL/A) for $1,299.00 and the 2.9GHz 21.5-inch iMac (MD094LL/A) for $1,499.00. Customers who choose one-day shipping ($3.99 for Prime Members) can get either model delivered by this Tuesday.
Additionally, Amazon is also promising delivery by December 24th for all shoppers who purchase by Tuesday, December 18th and select FREE Super Saver Shipping as their delivery method. B&H Photo is the only other Apple Authorized Reseller to reflect any available stock of the new iMacs, offering only the 2.9GHz 21.5-inch model for $1,499 or $1,560 when bundled with 3-years of AppleCare extended warranty protection ($108 savings). Prices and availability of the rest of Apple's product family can be seen in our Apple Price Guides, a portion of which is embedded below: