For new issue municipal bonds, the minimum quantity is 5 bonds (typically costing at/around $5,000 or at/around $1,000 per bond), with increments of 5 bonds thereafter.
Treasury auctions, most new issue CDs, and CorporateNotes Program offerings have a minimum quantity of 1 bond (typically costing at/around $1,000 per bond), with increments of 1 bond thereafter.
Fractional CDs allow for lower minimum investments in increments of $100, or .1 bonds.
New Issue Agency/GSE offerings vary in minimum and increment quantity. Generally, minimums range from 1 to 10 bonds. Increments range from 1 to 5 bonds.