the reason chi-chi is so expensive is because it isnt simple. wigs arent made to go into bumps so when u find a prestyled one it requires more hair and really wont look right.... id recommend spending a little bit of money and buying an arda base wig w a pack of extensions to sew into the wig to make the long pieces and then buy one of their bun attachments and add that.
your goku pic isnt working...... http://images1.wikia.nocookie.net/__.../7/7e/GOKU.PNG
is this the look u are going for? to get that good of spikes youll have to use an arda or epiccosplay wig made for spiking and still have to spike it yourself using foam bases