Genshin Impact PS4 Store Prices for Cystals/etc, no indication/mention of initial/first time 2x bonus. Hopefully available to all platforms/maybe handled on Miohoyos side? : r/Genshin_Impact
Genshin Impact Primogems: How To Farm And Use Effectively?
Game Genshin Impact Primogem Cosplay Costumes For Sales – Cosplay Clans
In-Game Purchase Price Comparison Table (USD) — I made this guide to make it easier for me to think about the dollar value of the different options. Hope it's useful to someone