Gary Price from Resourceshelf brings up 2 new sources:
You can shop easier with ShopEasier.com. , which uses SurfWax technology ( see results as you type) to bring shopping results from from 4 well-known online databases:Become.com ; Froogle ; Shopzilla ; NextTag
ZapTXT.com delivers keyword focused RSS alerts via SMS, IM, or Email.
In Gary's words:
+ Enter a feed URL
+ Determine Frequency of Alerts (Hourly, Daily, Immediate, as they are posted)
+ Determine Delivery Method (SMS, IM (Jabber), Email, Combo
+ Select Keywords To Trigger Alert (Boolean Available