You can find some amazing bargains from time to time.
The blonde bob wigs my twins wear cost just over £30 each (maybe £35) and are "Inspired by Natural Image" brand (retails for about £180ish normally) in size "mini petite".
I found those on Amazon, the almond mist colour that I got was that price, while other colours were much more expensive. Looking again now the prices are back up to £200, so I guess it was a case of right place right time.
This is the wig/colour that I snagged for £35 at the end of last year
I hate baggy wigs so I only look at petite, or ideally mini petite wigs. The bobs fit the girls' heads perfectly, no slipping, no bunching round the back.
I quite often search Amazon/Ebay for "petite wig" and see if I spot any bargains. I have quite a few that haven't been in any pics yet.