did the same with mine, needed something so my wife could get in and out of truck.
I had mine mounted at a 1 degree angle up, basically flat.
Then just put griptape on top.
Got mine from Addicted Offroad, they are Trailgear sliders, quality DOM tubing, cost at the time was $176 shipped to the door.
About $25 in spray paint what ever a roll of Grip Tape cost.
Then whatever you can get them welded on for which could be anywhere from free, a case of beer, $50 on up to $400.
Seems to me the average cost to have them welded on would be about $125.