Theres a ton out there. Build quality starts getting decent around the $50-$60, below $50 and its pretty crap unless its a good case on sale.
Case in point, this case is normally $60 but had a $20 rebate (god I'm sorry for that pun, I couldn't help it)
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119277&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
I personally really like the HAF series as well, this one comes in at $60
https://pcpartpicker.com/product/g9rcCJ/cooler-master-case-rc912kkn1gp