You can't flyfish if you're a
joiner old chap.........
Seriously - it doesn't have to cost a lot to fly-fish. I've honed my gear down over the years to the perfect (for me) set-ups. Many on here will tell you the same or similar.
I use cane and silk for streams and when the rivers are low. This outfit is beautifully balanced, and effortless to cast accurately.
Cost about £140.00 in total (line, reel and rod).
Orvis eight and a half footer for when the rivers are running normally, cost (with an Orvis Battenkill reel) around £150.00 in total (that included a line which has since been replaced). I've been using the same rod and reel for the last 20 years so they owe me nothing. The PP lines (available from PP on the forum) BTW are excellent.
I have a nice cane eight and a half footer for summer/autumn use (£60.00 off ebay).
Spend as much or as little as you want. Personally, I like old tackle, and the Youngs range of reels are nice to use, dependable, and still very affordable. Some like to spend mucho money on new tackle, or old collectable tackle, which is their choice and fine by me.
One of the best anglers I've fished with (John Wadham) used, when I fished with him, either old tackle, or cut-down rods adapted for whatever he was fishing for. His tackle may not have been show-room quality, but his technique and river-craft (to be accurate, canal-craft when we fished together) was way the best I've seen.
Don't believe the ads BTW - go by personal recommendation. This forum is a great source of impartial information regarding tackle.