I can only speak for the 3 or 4 that we looked at. Celebrity had all categories on sale and pretty much wide open on location - we originally had a giant balcony on the side of the hump. For our Ruby cruise that we ended up on, the Memorial Day sale on the September sailing, the Balcony Guarantee was the only balcony cabin to drop and that dropped to $1,799 pp. For the Fathers Day Sale every balcony cabin category dropped. BG guarantee was $1,299 up to a BA for I think $1,640, we spun the BG Guarantee wheel and got a mid ship BD for my TAs price of $1,199.
These sales were all before final payment, giving us about 11 weeks to find air if we needed it.