I have made maybe 5-6 transactions on LBC in the last week. Paypal has now limited my account, asked for documentation and asked what the money coming in was for. I need some advice.
Is selling btc and accepting paypal against their TOS?
Yes.
If so what is the best thing to tell them with regard to the nature of the transactions?
You made a mistake. Now, admit it & see what they say. No point of lying to them. They're going to know sooner or later. If amount in your account is not much then just forget the amount as they're most probably going to permanently limit you.
I am banned from circle and coinbase (for gambling transactions) is there there a third good option to sell bitcoins?
There are many options depending upon your country & payment processor you want payment in.
You gotta be more specific here in case you need more specific inputs.