I clean my glass with vodka and this skinny bottle brush (I think it is for cleaning old percolator type coffee makers), evaporate it down and add the "sludge" to some overly-dry pot.

KS, I would look into laboratory supply houses. Just google "pyrex laboratory supplies"- It may take a while to find a matching piece, but I'm willing to bet that those $57 glass pieces will turn out to cost less than $20!