Interesting; right now, July 22, 2022, on https://whatsminer.net/ it's:

M30S++ 110T
$4,590.00

M30S+ 100T
$3,200.00

---

That's like 50% off. I'm sure it correlates with the Bitcoin <> USD exchange rate, since mining $20k Bitcoin gives you 70% less money to pay your electricity bill than mining $60k Bitcoin.
On the other hand, buying one now at such a big discount and either starting to mine when the price rises again, or selling it when the prices go back to $8k-$10k for such a machine, might be a pretty good investment.