Forehead filler 3cc domestically imported

I came for a consultation today for 3cc forehead filler,
 domestically priced at KRW 450,000 (maintenance period of about 6 months),
 imported product at KRW 600,000 (maintenance period of approximately 1 year),
 and another imported product at KRW 820,000 (maintenance period of approximately 1 year and 6 months)
 
(I don’t remember the exact name.. I have the memory of a goldfish...)
 
Anyway, he gave me this guide, but it was a bit more expensive than I thought...!
Are domestic fillers okay? Between the domestic product and the imported product, which is better excluding the period of time? I don't want to spend more than 50 on my forehead, so I'm going to go somewhere else. Or, if I'm going to get a domestic product, would it be beneficial to get it cheaper at an event somewhere?