yea I think it's like $15-30 worth of webbing and shit, I'm sure if you googled it you could find exactly what you need, and you can buy all those things at REI.
slacklining is so fun but your gonna need at least 4 oval caribeaners2 about 6-8 ft lengths of one inche tubular webbing (as tree anchors)and a lenght of webbing as long as you want your line
you want to tie a bowline on both ends of both of the two anchor lines.attach one carribeaner to one anchor around the treeand two carribeaners to the other anchor.
then tie a bowline on one end of the line and attach that to the anchor with one caribeaner on it.
you then gonna run the line to the next anchor and tie a clove hitch around a caribeaner like 4 ft away from the anchor and then make a pulley system by going through the two caribeaners then back to the one with the clove hitch every time you go back and forth go under the last loop you jsut did. do that like four times and tighten as much as you want.
this might help tohttp://www.instructables.com/id/E1IPE3Z12CEYVZES47/
get 30 m...and don't be gay and get a ratchet, thats for pussies...you can do it with 3 caribiners(spelling??) but 4 is way easier especially if youre alone doing it