Here's one for you. I once bought a snare. I won't mention make or model. I'm in Europe, seller was outside of Europe. I messaged seller and asked if they could ship international. Seller agreed and said they would look into some options for shipping. Two days later a package arrives before I could even give the seller the green light. I was never quoted a shipping price and hadn't paid for the drum yet, but there it was at my front door within a couple of days. I had to pay the delivery guy some taxes (which I had taken into consideration) No problem there. So, now I have the snare and I've paid around 100 US dollars import taxes. I still haven't paid the seller a penny yet so I email the seller and tell them the drum arrived, what's the deal?! They reply saying that they're waiting on an invoice to come through for the shipping cost and as soon as they get that they'll add it on to the cost of the snare (which was around 300 dollars) I thought this was very strange, but I told seller I would wait for them to get back to me. About a week goes by and seller replies asking for something crazy like 240 dollars shipping and 300 dollars for snare please! I refused, they freak out and threaten me, I open a case with eBay, they tell me I don't have to pay seller and I can just keep the drum. I leave seller to stew in they're own juices for a couple of weeks as we try resolve the case between ourselves. In the end I paid seller around 200 bucks total and say, let it be a lesson to you. I sell snare drum 2 days later and make a nice profit.
I mention this as my worst experience as it was an ongoing pain in the backside. I didn't lose cash, in fact, I made a nice profit, but it was an unpleasant buying experience nonetheless.