HI -- Maybe this idea would work for you. Find or buy a flat cheap door and get some screw on legs ( IKEA) Or a shelving board from the hardware store. You can find lots of desks on Graigs List or KIJIJI real cheap.The desk in the picture is real cute and someone at a hardware store can help you with materials to make one like it . Just take the picture with you and know the size you need. The one it the picture looks very simple - just some plumbing pipes painted flat black and the top looks like a rement section of butcher block kitchen counter top .You could probably make it in an afternoon.

Well, there is always the student classic: two two-drawer file cabinets with a space in the middle and a flat unfinished wood door on top. You can stain and varnish the door yourself. I used that student desk configuration all through graduate school and loved it. The file cabinet drawers make it a very efficient use of space.

It looks like what they used to call the salesman's desk, 42" wide x 24" deep this one. might be 30" deep but I do not think so.
They look like legs from an old sewing machine bottom, which makes a great little desk especially now. Wish I had saved my pedal. When you are on the computer too long you could pedal your feed for leg circulation.
Top could be a piece of butcher block home depot. However home depot for less money will cut a straight piece of granite one slice straight with a back lip for counter top which would be. great so you would have a pencil lip.
just a thought.