Where can I find Nerf-like swords?

My little brother is throwing his birthday party in a couple of weeks, and he wants to have a sword fight like he did last year. I went to Walmart today to look for new weapons an they were out of stock. Upon further research, I found that Nerf has discontinued their N-force series, which means we can't buy any foam swords, axes, maces, or anything of that sort. I've even looked on LARPing websites, but all of the swords are about $100-$300 each! So my question is, Where can I find some good quality foam swords, at about $20.00-$30.00 each, in the next couple of weeks? Any help would be greatly appreciated! Thanks in advance!