I can send them to you from the UK if required. They are £22.05 each and shipping would be about £30.00 for 4 That would make an axle set £118.20 (currently about $184 USD)
I’m sure you must be able to get them in the US, perhaps others will post up.
Not sure on where you could get them in the US but the ones we tend to us are SKF Y Bearings with grub screws, 35mm ID, 72mm OD. They are all a standard size of 19mm to fit in the bearing carriers.
They only options is that you can have a choice of speed and load rating. By guessing I presume we use the highest with part number of YAR-207-2RF
Seals, are another concern. I got cheap ones in the US that had steel shields, that burned up pretty quick. The best ones I ever had were whatever Russell installed from the factory on the Anderson. They had nice rubber seals, and seemed to last forever.
I went with a complete 40mm setup on the Cobalt chassis, sooooo much easier to source everything….