At domaining.com is a useful tool called Closing Auctions, and it does pretty much just that.
Closing Auctions is a list of domain names being auctioned at Bido, GoDaddy, Flippa, CAX and Sedo, showing those with just a few minutes left, so you can snipe a bargain. It only shows domains that have an existing bid, so at least someone has decided it is worth buying.
While other factors should be considered before making an investment, the tool displays:
- Estibot value (via Valuate.com)
- Searches and Frequency – use these as a rough guide only
- CPC – how much bids cost in Adwords
I recommend setting the filter so that only those valued above $250 are listed.
And really, you should find domains you want by other means, and set an alarm to bid at the last minute. Purely using this tool means you might panic-purchase without fully investigating the domain.