I got my stuff at kegconnection but $70 seems high for a 2.5. Is that because it was new and not refurb like the 5 gal ones? That would make sense.
Either way, kegconnection can get you a full kit without the keg. I'm sure you probably need the hoses and fittings etc. those things add up. I customized my order by calling Ben. One of the things I changed was getting 8' lines as I've heard that the longer the line, the less chance of foam.