Firstly, are you sure that the engine has completely died and you need a new engine? Unless you have a ton of forbidden glitter in the oil filter or lower oil pan, or unless you have an extra inspection hole in the block, these 1FZ-FE engines are robust and can be rebuilt.
Colorado, and the surrounding states, have a ton of cruiser shops that deal with 80s. Many will also do engine swaps if you're interested in that.
There are lots of variables to consider (what repairs need to be done, parts/labor costs, how much of the work you will do, new crate engine or second hand engine, etc), but very generally, you're looking at 10K USD minimum for a total rebuild of the stock engine. LS swaps will be a minimum of 25K and diesel swaps are a minimum of 40K.
Remember, these shops are charging what the market will bear, not what you can source from online shops. Average prices for new cars in the US is 48K. New SUVs are around 70K. They're taking the current car market into account for their pricing.
Might be a good idea to join a Landcruiser club in your state and get some local advice.