Okay, so my mom's birthday is next week and she is a HUGE Red Sox fan... I was browsing Craigslist because I was figuring I might find some reasonably priced sports memorabilia there. Anyway, I found this thing, and I thought it was kind of unique. Its a handmade Red Sox logo mosaic. I know my mom would love it. Well, the guy who made it didn't have a price listed, and the ad said, "make me an offer" Okay, so I texted the phone number and I was basically like, "honestly, I have no idea what to price this at, but it looks like you've made these before, so what's the usual going rate?" and he said he made this in high school 8 years ago, and has only made other mosaics for personal use. Okay... so unhelpful. So basically, how do I make this guy an offer that is fair to me, and not offensive to him, because honestly, I tried looking on Etsy and mosaics go from like $30-$500+. This piece is 3'x2':
Also, yeah, it isn't finished. He said he could finish it by next weekend, but he has to buy supplies... so... Anyway, what would you pay for this?
ETA: Also, should I be offering to pay for the supplies?