A set of 50, 100, 250, 500 & 1000 ml Erlenmeyer flasks from Karter Scientific.

The 50, 100, 250 and 500 ml sizes could be used for stepping up from a slant or bottle dregs or for storing yeast slurry.  The 1,000 ml could be used for a traditional starter.

Glass Flask 5 Piece Set, Narrow Mouth Erlenmeyer, Borosilicate 3.3 Glass – 50ml, 150ml, 250ml, 500ml, & 1L, Karter Scientific 213B2


Also: Search 2 Erlenmeyer Flask on Amazon

Related: Yeast Starters & Fermentation – Resource Page | StirStarter Stir Plate | Yeast: The Practical Guide to Beer Fermentation