What I don't understand is, why will you get it bought by someone else and again ship it to you when you can buy it yourself directly. Even if you don't have a card, there are many exchanges which provide you with virtual cards and are okay for online purchases.
Unfortunately most cards I've tried have low limits and I have exhausted all of them.
As for the other problem, I have no intention to scam anyone - also, PayPal and card are both entirely reversible payment methods. Also, with escrow, you can't really go wrong.
How it cannot go wrong? Your reply does not answer the questions asked on this thread and your promise to not scam anyone is not worth anything on this forum, sorry to tell you.
Use localbitcoins or something, and sell BTC for cash. you can always lie about receiving the wrong product or none at all. The only way i see this working is the escrow receiving the BTC as well as the macbook checking that everything is fine and then forwarding the package to you.
Edit: Also with verified bitwala card you can spend as much as you'd like in day.