mouser, farnell, rs, digikey, ...
second hand ? niche forum with confidence users (radio, ee, audio) and ebay.
local shop ? well.....

since 90s, just nothing left. In any major city remains some store, with prices above this. Forget about searching precise stock or precise elements, their websites are a joke.
My last experience on local shop, one month ago: 50km highway (fuel & 3 pay points), arrive and park, 45 minutes waiting to be served, but then had no stock

I had seen it available on their website (?) then I decide to get it the same day. Well, no stock, I said I had called earlier. no response.... the replacement offered did not convince me, if requested the piece, with no guarantee of delivery or price, then delivery in two or three weeks. finally bored, with my quite stupid face, quite stupid face, I thought that for a large warehouse that remained, they no longer commit errors and servility that has sunk them. Leave the shop, after paying an absurd hour of parking, I got home, Farnell and the next morning I had. half of price .
Many years ago I was convinced that they are a dead business and don't try again. game over.
They die from the late 90's.
Before there was an entire city section to components and electronic equipment, then became computer stores and now all are mobile&ipads shops.
The country waste disposal policy prevents us to have recovery & repair electronic equipment from green stores. This is considered highly polluting waste and don't want to be recovered by individuals except for companies that are dedicated and certifieds to their treatment. I suspect there is interest among these companies, this is Spain and we have a long tradition of politicians with their family&friends in opaque contracts.