There are three ways to approach purchasing helium balloons: you can buy them already inflated, you can rent or purchase a helium machine and create the balloons yourself, or you can hire a professional company to create the balloons for you.
If you only need a few balloons, for a party or as a gift, your best option is to purchase them already inflated. You can find a good variety at any party supply store, some craft stores, and often your local grocery store. A party supply store will offer you the best selection in regard to designs and colors.
If you need a large amount of balloons, you can rent a helium machine from a party-supply store or a party rental company. You can purchase balloons there as well, or you might consider ordering them online. There are numerous websites offering every pattern and color imaginable. There are a couple of downsides to inflating the balloons yourself, however. First, it can very time consuming. Second, until you get the hang of the process, you might lose several balloons to over inflation. You might also have some inconsistencies with the inflated size of the finished balloons.
The third option is to hire a party supply company or balloon company to create your balloon decorations. They will provide professional and beautiful balloon displays that will save you time and effort. The cost can be prohibitive in some cases, but many companies offer affordable options.