So Kingston and WD launched their value series of NVME SSD's not long ago, the A2000 and new Blue series (I got the A2000). They're good value (duh) and heaps cheaper than the 970 evo plus, Samsung is going to release the 980 evo plus (PCIe 4.0) soon which will probably cost an arm and a leg.
I'd suggest giving the Kingston and WD a close look if you're in the market for a cheap NVME and can't tell the difference between a PCIe 4.0 and 3.0 like me.
Buy Pioneer 2280 if you are so price sensitive.