Knock off Tsums!!??

As I've mentioned before, my autistic grandson has an obsession with tsums. A couple of weeks ago, I bought several of his faves from ebay. He can't really tell at 4 but I'm pretty sure they are fakes! I do't mean to whine but I am rising him on a very fixed income due to my being disabled from a massive stroke at 39, when he was just a couple of months old. Tsums have had such an amazing effect on him and I'd love to buy him more but I'm not sure how to avoid buying more fakes.

The auctions all said authentic and NWT.

Is there a list of reputable sellers? I live hours rm any store that might have them so I am pretty much stuck buying online.

Thanks in advance, sorry for the 'life story.'