Sure, lots of stuff. Douglas fir bark, in fine, medium, and coarse; several types of expanded rock and coarse perlite; coconut fiber, chopped; horticultural charcoal, fine, medium, or coarse (I use only the fine and medium). You can purchase the Douglas fir bark heated or un-heated. Heating it is supposed to destroy pathogens such as mold spores. Some folks will use other wood (rather than Douglas fir bark), but I stay with the fir bark just because that's what I have always used. And for some plants, long-fibered sphagnum moss can be used, and the moss can be mixed with the above. I am sure other orchid growers can name lots of other material that they use. Each of us usually develops a "special" mixture and think it works well.
Big-box stores generally carry several different orchid mixes, and if you only need a small amount, that's an ok choice. If you are growing phalaenopsis, the bag will state the mix is for them and if you grow cattleya/dendrobium/vanda, the bag will have those species listed.
