Hey Sythe,
I'm looking to buy two [2] upgrades right now.
I'm really only looking for Paymo [Now renamed to 'Boku'] upgrades, which are SMS/Text upgrades, which would work VERY easily, for both sides.
It would work like this:

1. You give me a phone number/country, etc.
2. I'll fill the 'upgrade account' form out via the Runescape upgrade page [From my own computer, this way no account information has to be shared].
3. You a accept the SMS/Text [By pressing Y usually]
4. I will then wait 'till the 'bar' is full, once full, that means it was done successfully.
5. We will then trade ingame.

I will not be going first, unless you are VERY trusted.
By trusted, I mean 100+ vouches, 1k+ postcount, and 4+ years on sythe.
Or if your a staff member.

If you'd like to sell one, you can either add me on MSN or PM me.
My MSN is: [email protected]
PM me here