As is inevitably the case, the amount you will pay for your lists and associated services may vary between providers and will be based upon the specific nature of the lists and ancillary services you are purchasing.
As a broad indication, some entry-level list prices start at £0.05p per address provided, assuming that your segmentation is at the simplest level of geographic postcode.
Prices might typically increase in situations where you require more complicated segmentation by things such as age, occupation, gender and so on.
Prices might also be affected by whether or not you rent or lease your lists. As a general rule, rental prices will be based around a one-time use whereas leasing may allow you to continue to use the lists for a period of up to a specified number of months.
Finally, if you are asking for printing and distribution services as well, then your prices may arise again.
The bottom line price to you will depend very much upon just how many people you plan to distribute your materials to and who is going to produce / distribute them for you.