I use a battlemat and whatever is around (counters, numbered poker chips, some metal minis provided by a player). I never bought the D&D minis (I did get a freebie set, and I did buy a set as a gift for a kid and held back a couple of the scarier ones, and these few plastic minis I have count as "whatever is around" sometimes). I never played the skirmish game, nor do I want to.
If the packages weren't randomized and I had a clear idea of what I was getting in a particular set, I might consider purchasing.