$4 w/ contacts is only a little higher than you'll pay online from Mouser, and you don't have to pay shipping.
The mating housing to that shown in the picture is a Molex #03-09-1064 and uses contacts Molex #02-09-1119 for AWG18-22 or #02-09-1139 for AWG22-24. You can get the Mouser stock number by prefixing the molex P/N with "538-". Housings are 25c each and contacts (get extras as you'll probably mess up a few) are 11-12c each.
If you don't have a crimper, you can either mash with needlenose and solder or the Molex "cheap" crimper (I'm not a fan) is #538-63811-1000 at Mouser. It's $49. There's also a service kit Mouser #538-WM-50 that includes a bunch of housings of various sizes, pins, and an even cheaper crimp tool.