A trip to the North Pole will not be "economical," BY DEFINITION. Hence, you might have a hard time finding one that meets your needs. That's only partly because going there is inherently expensive.
In most "civilized" parts of the world, there is the potential for cheap "deals," because the "full cost" has already been paid by someone ELSE. That is, a home owner in some city might allow you to use an empty guest room for "free" (or a nominal amount) because the rest of the family has already paid for the house. A restaurant might have free or cheap leftovers for people, because its regular clientele has paid for their food, etc. "Cheap" public transportation (and other amenities such as museums) are state-subsidized.
At, and on the way to the North Pole, there are NO other "natural" users to share these costs, so the handful of users (as a group) have to bear the full costs on their own. The marathoners may get a "deal" from companies who want to sponsor them. But they are basically in the position of paying for the trip to the North Pole by "working" their way. Unless you can offer some kind of "endorsement," scientific, or other value for your trip there, it's unlikely that anyone would be interested in helping you defray your costs.
How does one get to the North Pole? If you have $1 million (or even $100,000 to spend on guides, transportation, etc., plus food, fuel, and other supplies for all of the above, be my guest. But that doesn't seem to be your situation.