Wow thanks for the quick reply!
The yarn doesnt come in oz..but it comes in grams...and i did a little conversion... this is the yarn i wanted to buy
so that means i need about 4 balls of those? o_o wow it seems a lot doesnt it? unless im calculating wrong...
Edit: oh dear i think i am mis calculating...silly me
i need about 2 of those balls to make 3oz hee..
Thanks for your help MaleKnitter!