They have ASICS DS Trainers (I thikn it is the XII - the model that was just replaced - red and white ones) at Holabird for $68 with free shipping right now. You can tell the good price until you click on the link. I am about to stock up myself.
I got the replacement for the NB 901 - the 903 - with a gift certificate I won and while they were very promising in the store, they are kind of wide and have a deep footbed. I wish I had gone with the newest DS Trainer, which I also tried.
The DS Trainer XII I live alot, although I have only had it on my mill.
I also always check Running Warehouse -
www.runningwarehouse.com
for deals. Just don't get the ASICS 2120 - it is too much shoe by far - alot bulkier than it appears in the photo. Don't let the price tempt you.