Welcome Amiibo cards are quite rare, at least the RV ones. I can find Series 1-4 at stores online, such as Toys R Us, but the WA and Sanrio cards are near impossible to find at a decent price, most people I see are selling them individually for a lot. :c I found my one WA card pack at Best Buy when they first came out and that's the only one I've seen.
I've heard that they're supposed to maybe release some this winter, but it might be rumors from last year. I hope not because I would like to have some, at least some more amiibo cards.
There's some people on etsy that have amiibo cards for decent prices, but they want like 50 cents -$2 PER card just to ship.
That's cheaper shipping than I saw on Etsy. Maybe it's 'cause I'm in Canada. I have Hopkins now 'cause I got one in my new game. Was hoping for someone more exciting but oh well.