[Q] Is this a scam?

I found yesterday on ebay a canadian seller who had an auction for a Samsung Galaxy S2 new unlocked international version.

So I did the usual send a message if he could end the auction for 280+Shipping
because that's what I have in hand.

This was the messages:

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Me: Hi I would like to buy your phone I have 280+Shipping

Seller: Hi there, yes i can do a buy it now for 280+20 shipping to Honduras. Send me your paypal email and i can send you the invoice that you can pay and i will ship out asap. thanks

Me: my paypal address is ***********@*****.net

Seller: Just sent you the invoice for 300. Please let me know when you have paid and confirm your address. thanks

Me: Hey I saw you didn't ended the auction and it got sold for 432!

Seller: No i have 2 phones that i am selling. You can still pay the invoice i sent you. I will still sell you the phone for the agreed price
So then I received a paypal invoice of 300$

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So do you think this guy is a scammer or not? Seller has 5 feedbacks and he is canadian, should I send the money? Would I be protected by paypal?

Item is going to be shipped to Honduras.

What do you say should I go on and buy it or not.

The invoice is legit, but I dont know if paypal will cover me if something got wrong. PLease help me ! :/