Sammelsurum, you are not the only one to run into the problem of expensive and hard to store miniatures. Though I haven't seen an abundance of counters on the net, there are several solutions available to you.
WotC included some with
Into the Darkness an introductory adventure for DnD, and Fiery Dragon Productions included some in a free adventure called Himrak War Party which you can download from the Fiery Dragon
site.
Other than that you might want to check out the awesome Counter Collections I & II also by Fiery Dragon. Each contains 450 counters with multiple copies of popular monsters (there are 20 Orcs in CC1 if I recall correctly

) and are a great value. The counter collections are illustrated by Claudio Pozas. You can check out some samples of his work
here. You can also find Claudio’s counters in several FDP adventures including the amazing
Of Sound Mind by Kevin “Piratecat” Kulp.
Dungeon Magazine has been including Counters with their magazine recently. You can find them in Issues: #85, 86, 88, 89, and 90. They are missing from the current issue #91 but they are slated to reappear in issue #92.
The D&D Adventure game also comes with a small assortment of counters with the same art style as the ones found in Into the Darkness. Some people also seem to be fond of
Steve Jackson Games Cardboard Heroes.
I hope this helps.
Omedon