You missed this sale, but, check out this one that is still ongoing:
Adobe UK Education Store Free Adobe branded laptop sleeve plus free shipping
If you have been thinking about getting Photoshop CS5 or Photoshop CS5 Extended, this is the best price you’ll ever find. BUT, it is for ONE DAY ONLY!
Save 30% off the standard price of a full version of Adobe Photoshop CS5 or Adobe Photoshop CS5 Extended when purchasing directly from the Adobe Store. Offer valid on 19th October, 2011 only. Offer is limited to one discount per customer, The discount will be taken off subtotalled amounts prior to calculation of tax and shipping fees. Allow 2 -3 days for software delivery. Offer is not valid for subscription products, OEM bundles, or education versions of software. This offer is subject to availability and to change or withdrawal without notice. Errors and omissions excepted. Void where prohibited by law.