I've done this a few times when I've been buying unique things, sometimes agreeing to pay half the price as a deposit or even the full amount upfront. (wolfsgamingblog.com)
You will receive the entire loan amount upfront when approved. (financiallitnow.org)
As much as you might want to ask for a large amount upfront, the research suggests that you should start small and establish a commitment precedent for continually bigger amounts. (inc.com)