With my Hobo Kelly glasses I think that there is a garage sale right around the corner from you and they have exactly what you are looking for. LOL sorry just playing,
So you have a 30" X 15" tank, do you want a sump? I like to go to furniture stores with a tape measure and look around to see what I could use that would work, you could repurpose something, hopefully it is in the scratch and dent section, reefers are more forgiving on scratches on there stands.
There are ton's of video on how to build you own stands, I built one back in the 80's with a screw driver and a electric drill, I have the lumber store cut all my pieces to size, I still have that stand and I put a car on top of it. Check ou the video KIng Of DIY how to build a stand.
If you want to buy a new stand look at IM APS stands, for reference see Marinedepot or Dr Foster and Smith for references.
A local custom cabinet shops, they love working on these kinds of projects, gets them away from the same old thing.
Check out Ikea.
Patience look for used on the local for sale section.
Good luck it can be a fun experience if you have the time and patience.