I purchased this cosplay wig off of eBay last year for drag day (my husband was my model <3). It is excellent quality and the cap isn't too large. I think it was around $30 with free shipping.
I also purchased this wig off if eBay and it is probably from the same manufacturer, but different seller. This was also probably around $30 with free shipping.
This last wig was from one of my local costume stores, a cheap 1920s style wig that I try to make look a little more shapely by teasing and hair spraying. :)