Are steel beams expensive?

Could you please elaborate on the cost of steel beams? I'm curious to understand if they are generally considered expensive, or are there various factors that can affect their pricing? For instance, does the size, quality, or supply and demand of steel beams play a significant role in determining their cost? Also, how does the cost of steel beams compare to other construction materials? Would it be feasible for smaller projects or is it mainly suitable for larger-scale constructions? I'm interested in hearing your thoughts on this matter.