The prices offered for each of those can vary by a factor of 2 and more, even though every row in the table below seems to be exactly the same part.
The table below should help searching for the best deal out there.
|Stripper w/Straight Blade||ERG1-WS||63817-0000||SAS3210|
for regular wire
for teflon wire
|PVC #10-#5 blade||63817-0072|