Sounds about right on cost for new, might ask around the forums for something used! Most new don't include line sets, you need a 10' x 50# or 90# set! That seems to be the common length! I use 10' x 90# myself!
John has a complete "learn to fly indoors" set of tutorials, here on Kitelife, covering setup to some advanced catch and throws! Pretty much everything you'll need to teach yourself, I know, I used them to get started! Just remember it is different than outside, no wind to pull you out of trouble! You create the wind with movement, in the proper direction, in the proper timing!! As you get better at it, everything seems to slow down for you! As a beginner, it all seems like a bit of work, and you exert yourself way too much! As you learn, the fact is, it really doesn't take anywhere near as much energy to fly!!
PS: an added bonus! Indoor really translates to your outdoor flying! The, I like to call it, "wait for it moment" you learn indoors, will slow things down in your outdoor flying!! The touch, the "feel" you develop, will certainly help your flying overall!
Forgot to add: most online stores carry them, either as "kite only" or as packages with handles! Since there is no single length of line universally preferred, that is usually left out for you to buy what works in your place of flying! Again too, asking on the forums can lead you to a better price, some already with line! Many "brick and mortar" stores will carry them too!
Got any questions, just ask!