Where can I find "food safe" glass marbles for sous vide cooking? I would like to find "food safe" glass marbles for sous vide cooking.  They can be used for keeping bags from floating, to space out ingredients in a bag, or even as "filler" space in a chamber vacuum to get a higher level of vacuum sealing.  Even for bags that don't float, the extra weight can keep the bags from moving in the current generated by a immersion circulator with a strong water pump.

Here is an example of using them as a anti-floating weight.



Many "toy" glass marbles are in China or other countries.  They may have lead or cadmium or have other dangerous metals or chemicals added -- especially if the glass is colored and even clear glass may be made with chemicals that are not "food safe".

Does anyone know where to purchase glass marbles or beads that are guaranteed to be "food safe"???
I would recommend using Whiskey Stones. They are used in whiskey instead of ice cubes. So they should be heavy, won't rust, and are supposed to be immersed in liquid that you'll consume. I think that probably meets all your criteria. 

Whiskey Stones


Another alternative is to use a rack. This comes with the Sous Vide Supreme and I find it quite useful for keeping meat submerged. It does however only accommodate certain sizes of meat. It works quite well. You can buy it separately online for $12.