Prestige points? Whats the best way to get to 100

I know sadly you can only buy these prestige skins, its really annoying that Ahri will cost at least 100$ but kai sa and akali will only cost 15, (if you grinded) so my question is will there be any bundle to have the option of buying this? like abundle with 20 prestige tokens or 50, because on the store for me right now the best way to get prestige points is the 2250 rp masterwork chests that give only 13 prestige points. Ironically thats 8 of them bundles i would have to purchase to get 104 tokens. like seriously? Being 18000 RP Costing arounds 185AUD for one skin? like seriously riot? Don't get me wrong i understand that its prestige but why cant it be like the vayne, kai sa or akali one? where you Could grind it out to get the champion and only having to spend 15 AUD if you play the game enough. Sucks that your expecting people to fork out 185 bucks for one skin. Disappointing considering Ahri is arguably my 2nd favorite champion behind zoe. so what im asking is Will there at least be a bundle? like even if its 100 aud Id be more instrested in that that having to fork out 200 dollars for one Skin for ONE champion.