The cost of renting a helium tank for party balloons can vary depending on several factors, including: Size of tank: Larger tanks will typically be more expensive to rent, but will also allow for inflating more balloons. Location: The cost of renting a helium tank may vary depending on the region, with prices being higher in some areas compared to others. Duration of rental: The length of time the tank will be needed will also impact the cost, with longer rentals typically being more cost-effective. Provider: The cost of renting a helium tank will also vary depending on the provider, with prices varying among party supply stores, gas companies, and online retailers. A rough estimate for renting a helium tank for a small party or event could range from $50 to $200 or more, depending on the factors listed above. It's important to compare prices and choose a reputable provider to ensure that the helium tank is safe and meets the needs of the event.