It's hard to say how much money you could save because it's different for everyone. Some people might refletch 6 arrows every week while others may only replace an occasional vane or two. I started fletching my own last year and this is what I started with. Jo-Jan mono fletcher $38, tube of Bohning Fletch-Tite $3, bottle of Bohning SSR Arrow shaft cleaner $6, AAE Plastfletch vanes $9, pack of ultra fine sand paper $4. So about $60total tostartup.

I used an dull pocket knife to remove the old vane and scrape off all glue. Then I'd scuff the area with the sandpaper and rinse under water. I'd then soak the ends in the Bohning arrow shaft cleaner for the recommended amount of time, then rinse and air dry. Once dry I'd start fletching. Takes me about 30-45min per arrow to fletch all 3 vanes. I could probably cut that time down by switching glues but I've been happy with the results so far. If you pulled on the vanes with some pliers you'd rip the vanes before they'd pull off the shaft. lol