I bought my 1st ETH from localethereum.com in 2017 (website doesn't seem to exist anymore). They had an escrow account where I had to deposit cash or bank deposit and the seller had to fund with his ETH. I don't remember the spread since it's been years, however, I would just be very cautious with these websites as sometimes the seller might dupe you into sending an interac e-transfer and might deny sending you... Source: about 3 years ago

I think you go to https://relay.radar.tech/ and "trade" WETH 1:1 for ETH. It is pretty cheap. As with most crypto, the UI kind of sucks. Source: about 3 years ago

I don’t really understand what’s your problem. If you deposited in a vault then you got shares of the vault in your account (yvWETH in case of the v2 ETH vault). If it doesn’t appear in your wallet and you’re using metamask, you can add any token by knowing the contract address of it (you can check it on etherscan) by clicking on add tokens and then in custom token. If you want to withdraw from the vault, just go... Source: about 3 years ago

I went to their website and only saw this (https://relay.radar.tech/) place to convert. Source: about 3 years ago