I checked netflix, hulu, and amazon prime and none of them have it available for free. If you (understandably) don't want to simply buy it outright sight unseen, then your other option is to use the other option.

I do recall enjoying this series. Around the time this series was out, there were also another couple of series that were in a similar vein, Traffic Light and Perfect Couples.

If you enjoyed Happy Endings and want something similar, look them up.

edit: jeez typos from phone