The best place to get free money is from the right wing crowd right now; stick a lets go brandon on something and they buy it – but that’s the same group that always bought the Franklin Mint coins on TV and stuff, so it’s not really a growing market.
There’s a market for selling meme as gag gifts when they come out and the Venn diagram between the two is there – but it’s saturated with a lot of college kids with brand new rubber stamping machines and stuff.
Every youtuber sells “merch”, so that’s a given. Make a channel, start selling merch, get your loyal followers to buy it, make it grow. Tens of thousands of youtubers following the same model, with a few bigs and lot of mediums and smalls doing the same