Both Steam and Epic have the Warframe: Initiate Pack on sale. According to ITAD this is the all time lowest price for this pack.
The base game is free and very popular highly rated (has more than 400,000 very positive reviews!):
Initiate Pack Includes:
- 420 Platinum: Warframe’s premium currency. Use this to buy Warframes, Weapons, Cosmetics, and more
- Nidus Warframe: Decimate enemies with this powerful Warframe
- Boltor Rifle: Fire deadly bolt projectiles at your foes
- Essential Base Damage Mod Bundle: Instantly upgrade the Base Damage of your Weapons
- Split Chamber: Equip this Mod to increase the chance of multishot on Rifles by 15% per rank
- 2000 Endo: Use this energy form to upgrade your Mods and harness their true power
I hope this is useful for some of you who love playing Warframe or who have thought about giving it a go!