>>5503813subbing is just for people to get the figures at the price listed, for jackal i highly doubt it'd get over $35, dont forget jackal is a common figure that is not exclusive to the subscription so more than likely you can buy him at your leisure
Mummra on the other hand I can see it going for twice as much easily due to the rarity and requirements to getting said figure, you wont be able to obtain him by normal means besides ebay and if it's for bidding, it really depends on how much people want him. He is the main villian, Thundercats are more popular than Heman (yes i said it) and he's only to be available this year. So the longer you wait after november, the worse the price is going to skyrocket.
TL;DR: save up to get mummrah for practically the price of half the sub cost or just do a monthly and sell the figs and make back what you spent to get him. I dont see mumra going for cheap, at all.