If I were to buy large silver bars, I would go direct and personally to a specialist bullion dealer. The large silver bars would replace the lead bars I use for weighing my safe down. (90 kilograms of them!)
I wouldn't bother with eBay fees or shipping costs.
For me, that is easy.
Although I live more than 30 miles away, I can get to a specialist bullion dealer on public transport with a senior's ticket for U.S. $2. Don't have to worry about parking or driving through traffic.
But those who work in the city don't even have to pay $2 extra, if their trip is part of their regular commute.
All of these extra costs have to be added to your purchase price, and it is impossible to recover them.