Hello, I've never used Etsy before, and have a question about custom orders... I'm wondering if anyone here has ever asked an Etsy seller to make a custom piece for you, and if so - do you offer a retainer, or something up front so they know you are serious about buying the finished product? Or, if you are someone who sells handmade pieces on Etsy, how do you feel going about something like this with a buyer would be appropriate? Is it fair to offer to pay for the materials up front? Or, maybe 50% of the cost? I want to make sure I am being fair to the seller, but also want to know to look for any red flags so I can protect myself on my end. I appreciate any feedback you can offer. Thank you!