need to source some cheap spur gear 20 deg face width 1/2"

looking for the following teeth size with 1/4 or 1/2 bore perfer 1/4

pricing for mcmastercarr for the following teeth size
20 $14.49
25 $15.08
30 $16.58

which is the beter size rack pitch of 20 or module 1?
planing on buy from stdsteel 200011 72"long

I believe module 1 pitch is metric. I would just go with the 20 pitch because it would be more common atleast in the US.