Supply can often be a problem. We in the States often forget that readily available items for us may not be as readily available in other parts of the world, and often more expensive than what we pay. Sometimes it's just the reverse, too. I once bought two cases of Armscor .38 Super ammunition on close out for $6.00 per box. A person on one of the forums I'm on lived about 20 miles from the Armscor plant in the Philippines, and said the best price he could get the same ammunition for was $19.95 USD. It baffled us both that the ammunition could be manufactured in the Philippines, shipped to the U.S., and sold at 1/3 what it sold for back where it was manufactured.
It's a strange world we live in....
A lube sizer makes it so much easier to size and lube bullets in volume. If you used a soft lube, such as 50/50 Alox/Beeswax, you wouldn't need a heater for it. Of course, the trade off is it's a little messy, and you can't bulk package bullets that have been 50/50 lubed, but they can be neatly stacked and they won't get nearly as messy.
Hope this helps.
Fred