Refill Station Or Other Cheap Option For Marker Refills?

If you use "professional" markers is there a way to refill them for cheap? Do you have a store that has a refill station near you, and it is economical to use? What if you can't find a nearby one? What do you do?

Refillable markers can be a great bargain as long as you have an affordable option for renewing them. You can change the tips as well, instead of having to replace the costly markers.

Do you have experience with markers that offer the option for refills and tip replacement? Where do you take yours when they need maintenance? What is a good price for these kinds of services?