knowing they sell a veriaty of knobs for furniture, I was wondering if I could buy a raplacement key which locks my dresser drawer?

Try ebay instead.

If it is a skeleton key type lock you maybe able too. If it is a standard groove key lock, you may need a locksmith.

I have seen some copies of antique keys, but there are many different cuts even for old keys. Good luck on your search.

I have no idea sorry , try contacting the store directly, go on line find store and get telephone number !