SCM Sales: https://steamcommunity.com/market/pricehistory/?country=US&currency=1&appid=440&market_hash_name=Haunted%20Griffin%27s%20Gog

I have RUB currrency and I will use key price 62.39 ref for every sale before 10th december, others 59.39 ref.

Nov 27: 34.272 / 207.484 * 62.39 = 10.33 ref

Not gonna check Nov 30 sale, because the price won't change a lot

Dec 02: 44.461 / 212.81 * 62.39 = 13 ref

No point at checking Dec 03, because it will be lower than buy offers (obviously)

Dec 08: 38.903 / 213.041 * 62.39 = 11.44 ref

Dec 10(1): 43.059 / 213.072 * 59.39 = 12 ref

No point at checking other Dec 10 sales, because they will have same price. Also no point of checking Dec 13 sale, because the price will be lower

Dec 14: 45.387 / 214.894 * 59.39 = 12.55 ref

Dec 15(1): 45.387 / 199.581 * 59.39 = 13.55 ref

Dec 15(2): 34.127 / 200.585 * 59.39 = 10.11 ref <---- it was pointless, but I still did it anyways

No point of checking Dec 19 and Dec 22 sales, because they will be way lower than current buy offers

Dec 20: 45.443 / 189.967 * 59.39 = 14.22 ref

Conclussion: 12.55 - 14.22 ref