Thanks that is exactly what I needed to know. It turns this post in to a side by side comparison so you don't have to scroll up and down so much:
X2 939 vs AM2 Pricing charts side by side
The charts are live not static. The charts below are showing only retail prices but the text at the labs.anandtech URLS will show OEM and retail. It's also worth noting that the Y axis has a non zero base so each chart is it's own animal and does not make for the easiest 1:1 comparison. Unfortunately I didn't generate the charts so I have no control over the Y axis.
It is most usefull if you bookmark this post and look at these charts every 3-4 days or write notes about interesting prices and check back later.
For example the 4000+ AM2 part is currently more expensive than the 4200+ AM2 part. As volume ramps up you can expect that to reverse.
Cheapest Retail prices on ATRTP + S&H compaired by hand at time of post make a static list of: