Tony Jaa is currently : in Thailand, shooting and directing Ong-Bak 2
It will take at least one year for the filming of Ong Bak 2 which got a production budget of around 150 million baht from Sahamongkol Film. The movie is expected to be released at the end of 2007 at the earliest.
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You can buy here some of the Tony Jaa's early films, filmed before Ong-Bak, when Tony Jaa was working as a stuntman for Panna Rittikrai. Attention, in most of those films Tony Jaa made a cameo appearance (sometimes less than 30 seconds!) so don't expect to see Tony Jaa in the leading role.
The very first film in which Tony Jaa worked on is "Singh Siam" (1992). Tony Jaa was 16 years old...
My recommendation would be "Mission Hunter 2".
Singh Siam [First Tony's film]  (Thai VCD)
Starring: Panna Rittikrai, Juliana, Peter Hook, Tony Jaa (cameo appearance)
Language: Thai, no subtitles
Region: All zones, 2 VCD
Mortal Kombat: Annihilation  (US DVD)
Tony Jaa was Robin Shou stunt double
Starring: Robin Shou, James Remar, Talisa Soto, Sandra Hess...
Language: English, French
Region: Zone 1