Yes this is crazy. About 10-11 years ago, I was at my local botanical garden spring plant sale. A vendor there had large variegated Monstera (deliciosa) in 2 gallon containers for $10. At least 3 mature big leaves per plant. This is NO JOKE. I bought four even though I already had one at home. I cannot believe the cost of these plants now. What I have learned over the years about these plants is this (here at my house anyway, it may be a totally different story at your house): if they cannot climb the way they want to, they will not thrive. I fortunately can give my plants all the space they require. But I would never pop for the big bucks to grow this plant indoors.
