No I don't think I would buy ritual magical items from eBay either, but for basic items that are only made magical by the things YOU do to them after you have bought them I guess that would be OK.

I get any basic herbs/remedies I need from a very good, well practised and talented friend of mine.

I must admit I haven't asked her where she gets the stuff she doen't grow herself.
I work a lot with crystals and their colour vibrations. Not magic exactly, more energy work.
But I would happily buy crystals and semi-precious gemstones from the internet, even eBay would be alright, as of course I would cleanse and charge them, tuning them to my own vibrations before using them.
There is almost no-where to buy such things around here. There was one shop that had quite an impressive array of different stones, crystals, gems and minerals, but that has changed a lot over the last year and now almost exclusively sells silver jewellry set with gems which, the sales assistants tell me, may or may not actually be the gems they are pretending to be.

I miss shopping there.
Ah well never mind, the variety of stones and sizes and quality is much more varied and impressive when you can shop from anywhere in the world.
The whole array of the worlds gems to choose from at the click of a button. How can that be anything but a good thing?
Lady C.