European blog OneMoreThing posted several photos of the mysterious offering earlier this morning, noting that they were spotted on the shelves of Dutch Apple premium reseller HTR for 119 (or $168) and appear to be the real deal.
Separately, AppleInsider has been pointed to similar listing on the German version of Amazon.com, which lists the 4GB model as being available in all nine colors for 129, and Austrian reseller Geizhals, where they're listed for 130.
Another Dutch reseller, A-Mac, also has the 4GB players up for sale at 119.
The photos published by OneMoreThing, as well as a higher resolution snap on display at Engadget, suggests the players are an official, but unannounced, offering.
Update: German blog Cyberbloc suggests that the 4GB fourth-gen nanos may be the result of a production fault, where Apple initially began manufacturing 4GB and 8GB models but made a near last-minute decision to market 8GB and 16GB models instead. As such, it's suggested that the 4GB models were a limited production that will be sold in Europe while supplies last.
Update 2:Apple Canada is also advising local resellers that they will have access to 4GB nano's next week which will retail for $139 Canadian. Quantities will be limited.