The primary cost of a short cat5 cable is in the sales process -
labelling, shipping, inventory, etc.; after that in the actual assembly
and test of the connectors onto the cable. All these are substantially
fixed. The only variable is the length of the cable, so reducing its
cost isn't going to make much difference.
If you want better value, buy several from a reputable supplier and
amortise the very likely fixed delivery charge over a reasonable number
of cables.
--
Graham J