I'm not familiar with Upname so I'm not sure if you are referring to historical sales or new / current sales. Some sources I use to research sales are listed below.
For historical sales there is NameBio.com and DNPric.es and dnsaleprice.com.
For most current / new sales there is DNJournal.com.
Upname had the most extensive sales history database I know of. They even had every domain sold on eBay archived in the databse, whether it sold for $1 or $1,000.
I checked out those sites but their database is not nearly as extensive as Upname's was. I'm surprised not that many people heard of them. I found them on Google, myself.