$30.00
These are marked HTV-873A, but Boss substitutes them for P873-G35-380 also (they are cross-compatible according to their documentation)
Also known as Roland model:
019-006
15229702
Used in
CS-1
AW-2
GR-700
MKS-30
FP-777
AF-9
And countless other vintage models from other brands . Very desirable and long since discontinued.