Notice the MSRP advertised for the Diecast Masters Company "CAT" models as shown on their website. These appear to be very detailed models similar to the Norscot brand.
Ertl/Tomy produce various John Deere construction models in 1:50 scale.
The Ertl Prestige and Norscot line of models are a good value and have nice features. My favorites are the Ertl/Tomy John Deere 200C excavator and 850K track type dozer that make good flatcar loads at a very reasonable price.