Have the ability to be able to set a budget for yourself at your plot (for a build). One way I was thinking was when you click on the mailbox, along with all the other options, you could have a button that says "Select Budget", kinda like how you can select someone else's budget on your plot, but you could make it your own budget. Another way I was thinking was there could be a bank system where you store all of your money, and then you can take out what you need and keep the rest in the bank account. I think this would be great for build challenges with other people, or if you want to do a budgeting challenge where you stick to a budget.