That looks like a great site, thanks. I am going to book mark it.
I checked on their Pyrex brand flasks and they are the same price, but the shipping is higher.
The shipping for a 2000ml Pyrex flask from Carolina is $7.95.
The Shipping from Midland Scientific seems to be a little fuzzy, but around $10 - $15.
And the stir bars still seem to be less expensive.
One of the great things about this site is that people are looking out for each other, and each others money.