Simcity Building: War matters
Just to give more information, @Amrouhech in A6 you can buy 5 of the same item with 1k, a great offer if we think that everytime you buy 1 item for 200 the price go up.
About the other fact, yes being in A4,5,6 with only 3 attacks is pretty difficult unless you have a helping club (this was my case when I joined this game in 3-4, the whole club gave me ducks and plungers for my comic hands disaster until I got the other but I was a pretty active member). Another option is going to A1 or A2, sad to say, these Arenas are dead (like no active enemies) and can be the worst choice, once you realize no one attack you back and you have to pay every item in every war is really hard to keep going there.
My suggestion, go to A1-2 just for some wars until you unlock more and then leave (no fun there you'll understand) and find an active friendly club in A4 or A3... a club that let you in and can be patient with you.
