Not worth it.
As it turns out, buying balloons online isn't worth it because the cheapest place charges just as much to blow them up. It's best to buy them from Party City (or some place that blows their own balloons for FREE) than online. Costed me $16 to get them blown up and the price at Party City was $16.99, basically making the online order and wait time pointless. But they are nice balloons, they worked well. However the large one deflates relatively quickly and costs a lot to blow up by itself, like $8.99.