I use the watchmakers case from Lee Valley. I get the ones big enough to put a tea lite in. Over time if they loose some of their scent for get yucky I just pitch the old tea lite and put a new one in.
I don't check the temp...just pour a little cooler than pouring candles. If I'm pouring candles & clamshells out of the same batch, I pour candles first and then wait a few minutes before pouring into clamshells. HTH
I love the look of these jars. Since the price on these are higher, what price are these going for? Those of you that are selling these, do you charge more for these vs apoth jar?