I use a desk similar to this -
http://www.walmart.com/ip/Black-Glass-Computer-Desk/9193530
It works pretty well for me, I have 2 monitors, keyboard, mouse, speakers, modem, and router on the top, and it leaves me plenty of extra space for other misc stuff like my headset, phone, note pad, plates and cups, whatever.
This particular one is a tad more expensive than your maximum of 70 dollars that I could find.
If the corner desk style won't work for where you want to put it or if it is too expensive you could maybe go for something like this -
http://www.walmart.com/ip/Sauder-Beginnings-Student-Desk-Multiple-Finishes/13044824
I used to have a desk similar before my current desk, I was able to have my whole dual monitor setup on it...