Amazon Japan made a special deal with the 3G / Wi-Fi version PlayStation Vita consoles. You can buy the PCH-1100 model (in black color) for only 16 441 Yen (with tax) while the normal price is 20 551 Yen (with tax). For a limited time you will get the console with the special Holiday gift from Sony the Santa’s boots case.
Please don’t forget that this model is an older version and a little bit bigger than the curren 2000 series slim edition but comes with better display and 3G (docomo SIM card included) connection support. But you can play all the Vita games and you can enjoy all the services on it just like with the Slim version. What can be a little bit harder to find for example cases for it later.