Farmer's Carry Handles - $180 with collars listed on Facebook Marketplace. This is a pretty good deal. The Farmer's Carry Handles currently retail for $205 and the collars are $45/pair. When you tack on tax and shipping you are looking at the neighborhood of $340.
There are set of Titan Fitness ones listed for $100 (no collars) on Facebook
Generic with screw collars for $80 on Craigslist.
Generic in Boulder for $150 on Facebook (no collars)
Simpsons Fitness with screw lock collars for $115
UPDATE: 7/10/2022 - I picked these up yesterday for $130. I felt like that was a great deal as they currently retail for $205 and the collars are $60/pair. Total Retail is $325 and tax and shipping puts me at $385. This represents 40 cents on the dollar.
Was listed for $180, I offered $120 and he met me at $130.