Just IMO, I don't see Ebay as that great now. I would use ebay for two reasons, 1. if I had problems getting locally, and 2. much cheaper price, (I'm talking new goods only here) I find a lot of traders are now, and have been for a long time trying to charge way over the odds. Now you might say well they won't sell if their to expensive, some people don't check, just order, assuming that ebay is still the best place.
A good example is only just this week I was looking for a diaphragm for my toilet inlet valve, just to keep as spares, for those who don't know what I'm talking about, its basically a simple rubber washer that costs pennies to make, B.Q sell them x 2 for £2.50 but they had sold out, no big deal I can wait, but just out of interest had a look on ebay, some were trying to get £4/5 for one, plus postage, it (weighs nothing) another trader was trying to get, ( shocking) £23 for 3, disgusting really. I've seen many many items way over priced and some people do get caught out. This may be one of the reasons ebay have been running adds on TV the last few months, plus covid no doubt.