I'll sell you 5 first, perhaps more later if the trade goes o.k.
BTCrow is the best option at http://www.btcrow.com/
Simple trade which is safe for both parties without risk of scam:
BTCrow protects sellers by holding buyer's funds and waiting for network confirmation that the bitcoins have been transfered.
You only have to release funds when blockexplorer confirms the 5 BTC arrived to your address you specify on the site, so you have zero risk me not sending you anything (or if I didn't, the funds would be simply returned to you)
I also can't be scammed because after the transfer shows in blockexplorer, it can no longer be disputed.
It's a win-win, post here or send PM if you're interested.
You can also propose any other reliable escrow service you are familiar with, or a forum admin/Morpheus.
Nobody will trust new members in a blind trade so I think the terms above are more than fair & 100% safe to you as a buyer.