I was just about to own up to those cards!
OH sent off for them. We have used Vista print for several years and regularly got the "free cards" offer through. You do have to pay for P&P butotherwise it's all free.
I just never had a pen and paper with me when I wanted to tell someone where to get advice for their "cocker rage" or "cocker cross" which turned out to be a working cocker! You know the thing!!!
Anyway, we only handed out a few, and I think I still have some with me now, but doubt I will use many of them here.
The other idea is to just write the website address on a bit of paper ready for the time you might need it.