Well...you can get cheap boxes from J&J and other places...but they're not going to be good quality ones.
Jumps...you can make them from PVC or plywood...easy enough.
You'll just need an extra person to load the box for you.
I don't know anyone that plays at home...it's really such a team sport...the fun is more in the racing other teams/dogs/etc. My guys don't find running to the box by themselves that much fun, seriously. They're happy with me throwing a ball in the yard.
Agility...have you thought about making up a course in your yard, probably would have more fun with that for the $$$
Flyball home page...there are links to equipment and such on here.
http://www.ashgi.org/color/Aussie_noses.html
"I don't have any idea if my dogs respect me or not, but they're greedy and I have their stuff." -- Patty Ruzzo
"Dogs don't want to control people. They want to control their own lives." --John Bradshaw