Refillable injector pen

I mean I thought it was cheaper then normal slin pin but it's not :(
Anyway why cartridge from aliexpress. Alibaba has same cartridge for 1/4 of the price.

btw I believe one can reuse a cartridge at least once
i mean you just injected in it sterile bac water and the peptide not a big deal isn't it?
 
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