I just checked my solder tin and it is also 0.7 just like the stuff offered by RS. For me it's the ideal size to work with.
You do need a chamber of commerce number here.
Officially.................................
It's unbelievable, I just ordered 2x 74 series IC's for the total sum of 0.86 Euro incl. tax. I would guess sending the bill (which they do separately) and sending the stuff would cost at least a couple euros but they don't have minimum order amount (except for some items, always indicated )and (in Holland) no shipping costs when ordering online.
The materials are shipped from Germany (by GLS) or England (by DHL, I hate that, they don't drop of items at neighbors, or even if the envelope fits in your mailbox they still want you to sign for such very small stuff....).