yes do it. it will be a great technique to learn and can increase your yield. it adds a bit of stress because your always pinning tops down but when you weigh out all the pros and cons you realize it is worth every bit of it.
just go shop around at your local feed and supply store, if they dont have them then they definatly know where to get them. its way cheaper than buying them online. i got a 30 lb bag of worm castings for 17$