Looking for a low cost NAS chassis

Been looking for a relatively low-cost solution to move my FreeNAS server into. I currently have six drives and will be needing to expand in the not too distant feature. So, looking to move to a rack case with more bays. I would like at least 12 drive bays, but more would be great. Seems Norco is my best bet. Front mount and hot-swap is ideal, but again, not a must. Any suggestions would be appreciated. Thanks.