I have a Serfas case. They run about $300. Worth every penny. I have thought seriously about getting a TRI case which would allow me to leave my rear derailleur on my bike rather than deinstalling it for shipping.
Let me tell you about rear derailleurs and shipping. Once I packed the bike in my box and I learned the hard way that it’s a bad idea not to remove the derailleur. If the rear derailler is pressing against the outer shell of the box, you can easily have your derailleur broken or, if you are lucky, have the derailleur hanger bent (which happened to me). Fortunately, I pack an extra hanger for my bike. It can be next to impossible to find a new hanger that will fit your bike unless it is a commonly used Trek, Cannondale, etc. frame.
I almost bought a Trico, just got better price on the Serfas from PBV which was selling the Serfas to its users – I think they still are selling them. I
Really, whether you get TRICO or Serfas or similar cases, you should evaluate whether you are comfortable removing the rear derailleur prior to packing your bike which you really need to do with most cases. I have contemplated buying the “Tri” case so I don’t have to remove the derailleur (I have started using the Dura Ace Di2 and its a pain to have to put the rear derailleur back on and adjust it). There are pros and cons to the Tri brand case. Pro – All you have to do is turn the handlebars and remove the wheels. Con – it’s a little bit wider and sometimes UPS or FedEx hit you for an oversize charge.
I also would remind you that if you want to do this cheaply, you can go to your LBS and get a cardboard bike box ( i.e., that the manufacturer used to ship a bike to your LBS). I used one several times and they are surprisingly durable and it certainly is wide enough to allow you to keep the rear derailleur on during shipment.