You don't need any special meters to determine the electrical cost of your lamps and heaters. You simply need to do a little math. The electric company charges you by the kilowatt hour (KWH), so you need to calculate how many kilowatt hours you are using per month. If you have a 150 W bulb and an 18 W fluorescent all on for 12 hours per day, 30 days per month, that's 168 W or 0.168 KW times 360 hours per month, or 60.48 KWH per month. If, with state and local taxes, you are at $0.20 per KWH (and that is pretty high -- you have to look at the electric bill to figure the actual charges per KWH, and that can be confusing), your lights are costing $12.10 per month.
Compare that to a 1,000W heater, on 24 hours per day for 30 days per month, which uses 720 KWH per month. (If it is on a thermostat, it won't be using that much electricity, because it will be cycling on and off.) At our fictitious $0.20 per KWH, that's $144.00 per month.
Another thing to look for on the bill is whether the previous reading was an actual or estimate. If you have an old electric meter where someone has to come out to read it, they may estimate the usage if they couldn't read the meter for any number of reasons. They may have underestimated what the charges were for the preceding month(s), before the heater was on 24/7, and then had to make up for it when they read the actual usage.
Halogen bulbs run about $6 give or take a dollar (if I recall correctly). Remember, you want heat, so don't get an energy efficient one. Wattage is really tough to guess because of all the variables that can affect temperatures. You could try a 65 W and check the temps to see if you need to go higher or lower.