Reddit mentions of Park & Sun Sports Spectrum Classic: Portable Professional Outdoor Volleyball Net System, Blue

As someone who lives in south mission beach, and plays frequently, Ill break it down for you. If you're all the way south at the jetty, those are "challenge courts" and they have rules posted on the posts. Weekday daytime shouldnt be an issue at all, but once 5 oclock hits those courts will generally be mobbed with people trying to play. Challenge court means that even if you're there first, someone can call "next" and youd have to honor it, and most likely, if you're beginner level and in a group, youd have to plays 2s, probably lose the game, and the court as its now the winners court. The more northern row of the jetty courts tends to be friendlier to groups while the row of courts nearest the lot tends to be the big boys. You're also probably less likely to get kicked off a womens net as those seem to lend themselves to womens games and coed group games. On the weekend, those courts can be used for closed games (no challenges allowed) until 10am, but then revert to challenge courts again at 10. If you move slightly north to Cohasset and Dover courts, those arent technically challenge courts, but there will be some advanced players on the Cohasset red courts tuesday, wednesday, thursday evening and weekends at 8 that will claim rights. The purple, green, yellow and blue courts on Dover are very coed/group friendly, non challenge courts that can be found open more than the red cohasset courts on the weekdays, and weekends theyll generally be taken by 8 or 9, and open back up by 1 depending on the crowds. Anything north of that are usually just posts and youd need your own net and lines to set up (same with the Pit across from Belmont park). If youre really trying to get into volleyball, and foresee many games with your friends and dont want to deal with the hassle of challenge courts, and avoid the dread of going to play only to find there are no courts open and dont want to assert yourself on challenge courts, you and the gang can always get your own net to set up for fairly cheap and never have to worry about public courts and getting the boot! I know thats a lot to take in, but it can be a little confusing and intimidating out there, and just wanna set you up for success and awesome volleyball!

Spectrum Classic Volleyball Net - Amazon

I have this one and it's great. If you get any model lower than this, then the net's just a bit too flimsy.
http://www.amazon.com/Park-Sun-Spectrum-Classic-Volleyball/dp/B0009PVUOG?ie=UTF8&keywords=park%20and%20sun&qid=1465284214&ref_=sr_1_1&sr=8-1

Out of the price range but you can't go wrong with this