There is a place down on Sprigg St downtown Cape Girardeau. They have equipment that Petco don't have especially in the Salt Water domain. However I have not puchased Fish from them so I cant say one way or another there. They do carry the plastic trim (in bulk, cut to fit) you cut out to make filter and lines fit thru that slides on the back of your glass top. I could not find that any where else in Cape. I don't know what your looking for, but definitely worth a walk thru. It appeared to me he seemed to specialize in Koi.
He's called travelers gazebo gardens and his quality iis alwaays really good. Prices a bit high, but he;s not blowing fish out the door until he knows their eating and acting right.. I;ve made the mistate of adding a petco special to a predominately travelers sourced tank and it's taught me a big lesson,,,,quarantine quarantine quarantine. or wait for a travelers order.