16GB of DDR4 3000 2*8GB can be found for around 110 dollar. That is a increase of around 20 dollar compared to before the spike in prices. Lower speed memory actually have suffered more from the price increase or the 16GB modules.Would it make sense to buy a single 8 GB stick of DDR4 right now?
Then when prices come down, I'll but a second identical stick.
For example
2400/2133 16GB 2*8 before the price increase was around 50-60 dollar and now all the way up to 100-120$
3000 16GB 2*8 was as low as 90 and can still be found for around 110-130dollars.
So I would say best buy you can do now is 16GB DDR4 3000 , buying a single low speed dimm would not make you save a lot at the end.