(of prices on the stock exchange) fall sharply

That's the verb form of break in that sense I mentioned earlier. Technically/specific language.

Anyways, I'm thinking  it might mean "opportunity" or "chance" in the context of your sentence. Otherwise, if they meant price, it would be a million times more common and natural to use the word "deal" (this is an incredible deal). I don't think I've ever heard "break" used to mean "deal". So I think it must mean opportunity or chance here.

*edit: or they would have said "what a bargain", as you said, if they meant price.

Interesting sentence haha

Gertie. Thank you for breaking down the "break", especially the big break which I never learnt before.

I saw this sentence in a show "Mom", season 2 episode 3. the context is that a beautiful house in which the former owner got murdered is rented a super low rate, and the two potential tenants are discussing about if they should rent.

As far as "does break mean low price", I would say no, not really, although if I dig through the dictionary I can find:

a sudden decrease, typically in prices.

But even that is not the same. And I can't even think of an example of when we use that meaning...

Anyways, the point is it could actually mean a lot of things.