The heat bulbs are so expensive at the pet store $11.99 for a 150w so went to TSC and they have a heat bulb for $8.99 for 175w which is a better bulb because it is thicker. My question is, is there a cheaper way of purchasing bulbs? I was wondering if something like a flood bulb would give off a lot of heat or am I better to stick with the heat bulbs. Thanx.