It seems to be possible to donate via ebay – go here:
As I don"t play ebay, I"ve no payloss account, either. But I would certainly not be curmudgeonly when I"m paying for the RPi. And such a drive-by-collection, maybe with a short popup informing about the charities goals (for those who have still not heard what it is really all about) would certainly be worth a try.
As Lynbarn mentions you don"t need an account "guests" can pay via credit/debit card
The eBay missionfish account referred to above does work, but I believe that is only applicable for items linked to it and sold on eBay, which restricts its effectiveness as an income stream.
There are various donation channels open to the Foundation, including using the PayPal gateway on their own web shop. Incidentally, donors (or purchasers) don"t need to have a paypal account – any credit or debit card can be used. As a charity, they will be able to take advantage of discounted transaction charges that PayPal offer too.
As a charity, they will also be able to benefit from Gift Aid from UK taxpayers, although that is a little more complicated to set up.
In order to ensure that your donations do get to the Foundation in the most tax- and cost-effective way, it is probably best to wait until the Foundation announces the arrangements they have put in place.
It can be used even if you are not buying/selling when you follow the link it gives three tabs Buy/Sell/Donate Now – choosing the latter allows you to make an independent donation without any link to an item being sold.
I just tried it and it says:
Your order summary
Charity "Donate Now" Donation via MissionFish£5.00
Total £5.00 GBP
and they also allow you to use gift aid (tax purposes) however they do charge 3.75% of the donation aswell – so I think your mention of waiting for the foundation to announce more solid plans may be better if they can keep more of the donation via an alternate donation method – however if someone wants to donate right now this seems like the best options (I think I"ll wait too and cancelled the above transaction for now)