Probably known about already, but there's a free bundle in the store at the moment. You can claim it for the next 6 days.
Should be the top-left item in the store, just called "Summer Sale".
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@Its_Travis_199 I'm pretty sure of that too to be honest, makes sense to me that way anyway, I thought it was an interesting question and a concrete confirmation would be handy.
I got the same error message as you though on the claim screen and I'm currently on level 99, so I'm not 100% certain that it depends on level.