Where or how can I get a BTC adress starting with 1?
I have a very (!) old version of a vanity generator. It's since before the scammy ones also came onto the market.
So for the rare cases I use 1* addresses, I can also make them look nice if I want to.
Since many other cases were already covered, I've added this only to show that
the possibilities are many.
It's all up to you (and your skills), to the wallet you want to use, to the amount you want to use this address/these addresses for (the bigger the amounts, the more important also the safety measures).
Maybe you consider giving more info so you can get more relevant answers.