18,190 FG normal price, -25% off if the LP gains are what you say they are (13,642.5 FG)
Season 5-9 challenger
Can guarantee very high winrate and 0% chance of ban
Safe to say anyone offering you slave labor prices can’t say the same
Price source:
SILVER:
15 fg Per LP gained
Division Promo: 600 FG
Promotional tier: 800 FG
GOLD:
20 fg Per LP gained
Division Promo: 800 FG
Promotional tier: 1200 FG
PLATINUM:
30 fg Per LP gained
Division Promo: 1500 FG
Promotional tier: 3500 FG