Pokmon card prices can fluctuate wildly, so it's impossible to put a concrete figure on the cost of any one card
Later in the game you should be able to pay the escape cost, especially if you have any amount of self-mill (dredge, Im looking at you)
There is a total of 20 different bonus cards available that vary in value, and each one has the same odds of showing up in your product
Primes were the top holo rarity in HS Triumphant, and they ran roughly one per six or seven packs, so a 36-pack box averaged somewhere in the four-to-six Prime range
My friends and I never played, but collecting and trading was all we did for months until a lot of my friends parents put a stop to the madness, sadly, and stopped purchasing cards for their kids
And I do think they've managed to do that pretty well