I do have a PayPal account. IDK they sold BTC?
They do. Since you are from the US, you can buy BTC through PayPal except if you are from Hawaii. But I don't recommend PayPal because, at least for now, you are not allowed to withdraw your Bitcoin to your wallet of choice. It's up to you, though.
Can you recommend a escrow service? I've never used one? I want to buy about $400 worth of BTC to send to my electrum account.
Please take time to read at least a few threads on this board:
https://bitcointalk.org/index.php?board=53.0. If you are already familiar with how things work, you may open one for yourself or reply to someone who is selling Bitcoin 1:1.
The list of trusted escrows is here
https://bitcointalksearch.org/topic/recommended-bitcointalk-escrow-services-2439910. You may also check
Escrow Service of Bl4nkcode [Active]. You may disregard the use of escrow if you are dealing with a high rank and highly trusted member, though.
Yes, you may choose to have your BTC sent to your Electrum address. Just make sure you downloaded your Electrum wallet from no other than
https://electrum.org/, kept more than a single copy of your seed somewhere safe, and double checked the address.