The correct scientific name is Monstera deliciosa. It's not a Philodendron, although it is a close relative. Calling it by any other name is wrong and misleading. As far as I know, there are two cultivars, 'Albo-variegata' & 'Thai Constellation.' The natural green starter plants are still for sale at reasonable prices. Larger, mature plants can fetch a higher price. I've also been noticing their popularity increasing.

Philodendron pertusum is a name that was misapplied to Monstera adansonii in the mid 1800's. There's been discussion about that name here before. It's a problem when nurseries resurrect incorrect scientific names, causes a lot of confusion. Unlike today, back in the 1800's very few would have known the difference between Philodendron and Monstera.

I agree with the others re: the genus being Monstera and not Philodendron, based on my readings. Where I am more confused is what is M. deliciosa vs. “var. Borsigiana.” There was a rumor going around that anything without the wrinkled portion at the leaf and petiole attachment (don’t know what that’s called) being Borsigiana, but I’ve seen some mature legit deliciosa have younger leaves without the wrinkle. I just can’t tell. I can’t even tell what I have, and no clue about the plant I had before! Haha.

The variegated ones, be it yellow or white, are stupendously and obscenely expensive in the US. I can’t find a proper cutting with a node with a minimum of two leaves that costs under $130 or so (or else I’d have one!). I would love to grow one but for that price, I have a list of 5 more I’d prefer to grow. Even when you do find one, it may have to be shipped from overseas and the risk of it passing customs or not is on the buyer.

At least here on the west coast, the cost of regular green Monstera deliciosa is reasonable, anywhere from $10-40 depending on size, retail store, and condition. They are primarily labeled as “split leaf Philodendron” still, and are usually pre-fenestration and juvenile, so maybe that’s why it’s cheaper than one would think. That said, it’s not common and readily available like some other common houseplants like spider plants or pothos, which are literally everywhere in every store. The M. adanansonii is rare to be found, but when you do, it’s not as expensive as one would expect. At the time I got mine, it was a good $50-100 for a cutting online (+ shipping + risk), but I found it for $49 with a good 6-7 leaves. Still highway robbery - but less so than online.

Never heard of yellow variegated Monstera, that's a new one on me!

Edit, it's Stewarts jon here, I appear to have inadvertently created a second account on my tablet!