JCPenney has select air conditioners on sale.
Plus, cut an additional 10% off the sale prices with code: FRIDGE7
Shipping is free.
Update: Now $139.
GE 115 Volt 5,500 BTU Window Air Conditioner – Link 
Hurry on over to JCPenney where this is currently on sale for only $99 w/ free shipping!
Additionally, if you are a Orange & Rockland or Con Edison customer, you are eligible for a $25 Rebate from Orange & Rockland or a $30 rebate from Con Edison, with the purchase of this air conditioner. This brings the total down to $69.99 – $74.99. Rebate is good for up to 4 air conditioners. Orange & Rockland rebate can be submitted online here
GE ENERGY STAR 10,000 BTU 115-Volt Electronic Window Air Conditioner – Link 
JCPenney has this on sale for $249 w/ free shipping.
Additionally, if you are a Orange & Rockland or Con Edison customer, you are eligible for a $25 Rebate from Orange & Rockland or a $30 rebate from Con Edison, with the purchase of this air conditioner. This brings the total down to $219.99 – $224.99. Rebate is good for up to 4 air conditioners. Orange & Rockland rebate can be submitted online here.