I agree with Wyogal, but will take this one step further - Do NOT use ANY mold that does not specifically say it is for molding at extreme heat. If you used a plastic mold that is made for say, chocolate, which melts at a much lower temperature, you will just go right through the mold instantly causing a mess and great danger to yourself.
I work with hot sugar a lot in my work and you have to be extremely careful with it. If you can find some molds online at the sites Wyogal mentioned, I would order them. Even though it will cost more for shipping, etc., it is worth it in the end.
"Variety is not just the spice of life, it is the key to life" - Chef Michael Smith