Oh yeah, that sounds about right, and actually a little on the low side. It costs about $50 to send a pair (though I have had 3 Silkies sent in the same box, but they are tiny) In theory it should have cost about $150, 2 birds per box, so 3 boxes at 50 each. I think you are getting a deal.
Oh and if you aren't already aware the pullets will have their beaks trimmed. I guess they do alright, but it is something to think about.
Look on Craigslist or post a wanted add on here, you might be able to find hens closer.