How can you go around 81map with inexpensive items?

Also, all the expensive items are in the lock chests, Can I wear the item only if I pay in cash?

It's so hard to wear good items.

1. Are red good items only in lock chests?
2. Can we open a chest with a plate coin with a crate key?
3. Where can I get the crate key?
4. In order for me to collect gold, I have to have good items. In order for items to be good, there must be a lot of gold. This is a contradiction.
5.

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