Your title says Microsoft internet keyboard but your contents say different.

This is Ms internet kb. I have one. Still using it in my rig.

1996
1USD = RM 2+
1SGD = RM1+

2019
1USD = RM4.2
1SGD = RM3

cannnn
u just calculate inflation and currency differences and that amount is the same amount that u should be paying.

if u buy USD 50 keyboard during 1995.

with inflation and currency exchange
according to inflation.
USD 50 = RM 230+
inflation RM 230 = RM 400 ( inflation rate is 77% according to the inflation calculator)
So there u have it, ur budget should be RM 400 to get equivalent values of USD50 keyboard