Looks like a blade that's more fashion than use. I've seen some things similar in army surplus stores, and some gas-stations that have trinkets for sale. Exact site and where to order one, I'm not sure. I guess just look around, there's bound to be a place that sells them.
Here's a place with some that look similar.
http://www.5stardeal.com/browse.asp
http://www.5stardeal.com/website/swords/largepictures/20-3053.jpg
http://www.5stardeal.com/website/swords/largepictures/20-74G.jpg
EDIT: Other Similars
http://www.edgeimport.com/store.cfm?event=itemdetail&itemid=1035725
http://www.edgeimport.com/store.cfm?event=itemdetail&itemid=572500
http://www.edgeimport.com/store.cfm?event=itemdetail&itemid=825198
EDIT: More as i find them. Seems the Dragon series is the most common for them.
http://northstarzone.com/sitebuildercontent/sitebuilderpictures/1MC-2095.jpg
http://northstarzone.com///1HK781150.jpg
http://northstarzone.com///1HK56082-1.jpg
http://shedevil32.webs.com/kinvesswordsdaggers.htm
http://www.freewebs.com/shedevil32/17KR15%20Kit%20Rae%20Archeros%20Dagger.jpg
several here that are interesting and similar.
http://www.shop.collectiblecutleryltd.com/Fantasy-Daggers_c116.htm
At this point i'll stop. Keywords to put in a search engine are Display knifes/daggers, and fantasy daggers.