should I buy him or save up

If you barely have any runes then I would go with runes. Runes can be used on any champ and make that champ stronger for that game. Get the appropriate runes though :) But if you love love love fiddle then get him instead. Either way you'll have them both with enough play time :)

Fiddle is a great champ, but he is very difficult to play. I recommend taking UR scrub moneh and buying a shit load of runes

Those with runes DOMINATE over those without runes

Ive played fiddle sticks quite a bit what do you expect to do with him yeh yeh i know jungle but leme just help you out here

(I like spellvamp quints on him) but ap works fine Amazingly easy clear but verry blue dependend can get dragon at lvl 2/3 easy Verry squeeshy yet able to be full health during his clear the entire time

can gank pre 6 and honestly his ganks at 6 are better but i feel like his ganks overal are not that great compared to a jungler like nidalee/shaco