IMO too many people give up on their Wyeast on whether the pack has swelled or does not swell. I have had some that came partially swelled and they worked fine. I have also had a couple that didn't swell (delivered in cool weather) at all and it was also fine.
Another mistake is that when making starters sometimes all the action occurs while you are away. You might not see any action and still, all is well.
What I have for the summer months is: about 20 vials of frozen yeast. I have 6 or 7 different styles so I am not confined to a particular style. I have also just ordered some supplies and a pack of dry yeast. I also have US05 for backup.