iPlan perhaps doesn't even use it's own fiber, apparently there are more companies offering it. But it's legal to call your company FiberTel in Argentina and then sell cable not fiber, so the situation is pretty opaque to me.
The full price is 1200 pesos, around 75 bucks. So not cheap. But to have something that works reliably up and down it's peanuts, the cheaper options are not as reliable and have asymmetric speeds. Stable videoconferencing is a must.