So is there no way to get more Mecha Tokens?

I am kinda new to this game, and i was doing the Kingdom Mecha missions and saving up for the Garen Prestige Skin at 2000 tokens, and have 1750, and was so close, but when i woke up the next morning the missions were gone besides the (Get 20pts mission), and it seems i cannot get tokens without buying the expensive pack... (Like $70 i think?) Will there be more missions soon, or am i just not gonna get the skin even though i came so close? I was doing the mission on getting 200 points to get 200 token missions, but don't see them now. Really bummed out.