Amazon.com currently has Photoshop Elements 6 as their "Deal of the Day." They have it on sale for $59.99 with an additional $20 mail-in rebate for those with previous versions. I use PSE6 for all my photo editing because it's simple to use and produces great results. Trust me, I don't think you'll find it any cheaper (about six months ago, I bought my copy for about $120).

Here's the link:

http://www.amazon.com/gp/goldbox/ref=cs_top_nav_gb27