10 million numbered notes are rare, so the catalog value is only a suggested price - it depends mainly on what you're willing to pay and what the dealer is willing to sell it for.
I've seen a 1954 $5 10-million note for sale twice. The first one was an UNC-63, and the dealer wanted $4,200 for it. The other was in EF-40, and the dealer was asking $2,600 for it.
Rare notes like this can have huge price variance, depending on what the seller originally paid for it, and therefore, what kind of profit margin they're getting.