Everyone makes fun of newbies buying ready-built dipoles on eBay, but
nobody can direct you to where to buy baluns? Searched hi and lo
online, and what I found, was more expensive than buying a ready-made
dipole! I'd like to buy a balun, and attach my own cut-to-length
wire, but can't find cheap baluns ANYWHERE.

Where are you Elmers buying your baluns?