I think most domes from pet stores will have the holes but if you buy some heat lamps from a hardware store they probably won't.
I haven't seen them in a hardware store (never looked for them there) but the ones I've seen in feed stores definitely do have holes- ppl use them to warm chicks etc.
Rudeness is the weak man's imitation of strength. Eric Hoffer(1902 - 1983)
“The greatness of a nation and its moral progress can be judged by the way its animals are treated.” ~ Gandhi