I don't think there's any other guaranteed samples. I think the others are in random loot, or you can try buying some or making your own. --- PSN: Mental-Gear (feel free to send me an invite, just tell me which board you saw me on) If you haven't played LittleBigPlanet online, you haven't played LBP.
Sadly, making your own gets a very short duration. I have a journeyman alchemist with decent gear (2 expert, 2 journeyman), who can produce a 2 second paralysis poison, and would extrapolate a master with master gear getting maybe 5 seconds.