It looks to me like knitqueen has offered you the best bet. I wish I had known about WOA from knitpicks before I knit my booga. WOA is 1.79 for 110 yds. - which would be hard to beat!
I can recommend what I used as another inexpensive option. I used Patons classic which I purchased from Michael's (chain craft store) for about $4.00-$5.00 per 223 yds/100g.. So if you figured by the yard, it is just a little more than WOTA - but I didn't have to wait or order via internet. I bought 2 balls of the Patons for the same price our LYS shop sells 1 50g ball of Noro! I single stranded with the Patons, but next time I'd double strand the bottom to make it stronger (and maybe the whole thing really).
Single stranding it, my bag
cost me around $6.00 to make (since I barely tapped into the second skein of Patons). If I'd made it from Noro purchased from my LYS (selling it at $9.50/ball), it would've cost me around $30.00. I'm not knocking the Noro - it is beautiful. I just needed something less expensive