I made do for some time with a pair of adjustable steel sawhorses. The pair was rated for 2,600 lb. I affixed 2x4 lumber to the top, both to spread the weight and to be able to add stops to the ends, to keep the bar over the base of support.
Getting a rack with spotter arms was far, far better, for many reasons, of course.
Another approach might be to build jerk blocks, to hold the bar at the plates, instead of the bar itself. The sawhorses made fine adjustments easier; blocks would have been more sturdy. Blocks require more lumber and skill to assemble, but are probably cooler... The sawhorses can fold up and hang on the wall.
SSC Phil Meggers has a series of videos on building jerk blocks:
How to Build Jerk Blocks - Part 1: Stackers - YouTube
How to Build Jerk Blocks - Part 2: The Topper - YouTube
How to Build Jerk Blocks - Part 3: Finishing Touches - YouTube