Walmart offers two Unique Industries Assorted Shape and Size Latex Balloons 50-Packs (100 balloons total) for $3.40. (There's a minimum order requirement of two.) Opt for in-store pickup to avoid the $5.99 shipping charge. That's tied with last week's mention and the lowest price we could find for this quantity by $3. These biodegradable balloons come in assorted 4.5", 6.5", and 13" sizes.