I have Some Brand New Sliders from Dirt bound off road, I bought them awhile back but never used them due to the fact I did the 2x6 Rocker Replacement
They are WELD on ... I bought them brand new for $230 willing to sell for $180.00 OBO
Not a bad deal the material & about 1 hour labor to build alone is close to what you are asking! Good luck! I already have my own weld on. Any body in my area buy these I'll help you weld in at my home !