Where can I buy threaded fixed-gear cogs (3/32") for a reasonable price?

I recently got a used Cutter Bones singlespeed/fixed gear bike on the cheap for doing errands around town. But the singlespeed freewheel needs replacement, and while I wait for that order to arrive I've switched it over to a fixed gear setup.

Turns out it's kinda fun as a fixed-gear bike, but I want a smaller cog for that (going from 18 teeth to maybe 16). So where do you all get your threaded cogs? I saw that Surly sells some, but for like $30 a piece, which seems excessive. Ideally I'd like to get a set of cogs in the range of 14-17 teeth to experiment and see what works for me, if they can be had cheaper.

I am a many year 3/32" drive train adherent. Most of mine are Surly and Soma which are kind of a step down from the really good stuff. But if their $30-ish price is still high for you...I won't insult you with a "Let Me Google It"...meme but that is my answer. There are tons of lower-priced "consumable" types of 3/32 cogs out there if you just search. Good luck...

These folks appear to have some decent-looking cogs at reasonable prices.

https://www.randombikeparts.com/coll...g-threaded-new