Need a cartridge heater 12V

Hello, I'm a student, Ricardas.
What would be the cost to buy MOQ of heater cartridges with these specifications for my school's R&D trials?
If it is possible to buy a cheaper standard cartridge that fits within specifications, please say so. I don't know if customization costs way more than standard dimensions.
1. 150-165mm length (bigger is better)
2. 8–12 mm diameter (smaller is better)
3. 12-14.8 V voltage range
4. 250W@12.6V (nichrome mostly wound at the farthest end of the heater from the threads, heating mostly the tip) 
5. A K-type thermocouple is installed near the tip of the cartridge (closer to the thread side than the nichrome, near the tip where more nichrome is wound).
6. 1/2" BSPP threads (I can make an adapter if any smaller thread is used)
7. Preferrably wires with silicone insulation 
8. Wire length: 20-30cm
I'm in Lithuania, Klaipeda (city), LT93168 (postal code).
What would be the price of the MOQ, and what is the shipping time and cost to me?