Even decent hardware stores typically carry them. They come in a bunch of sizes, and I think they were maybe $8 apiece the last time I bought some. Taking the old one with you is definitely a good idea.

It's an incredibly easy DIY job, BTW. One single philips head screw at the very top and the center spiral shank just slides sideways to release from the window frame edge. I'd guess YouTube is full of short instructional video clips...

jimmysglass.com
+1 201-941-4401
137 Palisade Ave, Cliffside Park, NJ 07010
I don't know if these guys still do that kind of work, but they did an excellent job for me some years ago, replacing broken glass and spiral balances in a long parlor-level window. They aren't exactly local, and I know a lot of businesses who previously came to JC won't now, because of traffic congestion and impossible parking, complete with fines and tow-aways.

If you want to go the DIY route ? it's not difficult to replace window balances, I've done dozens over the years after learning how ? SWISCO ( www.swisco.com ) in Camden, NJ has all the replacement pieces, excellent service, and helpful ?how-to? videos and information on their website. You'll also need to buy a ?charging tool? ? around $15 ? so you can wind the balance springs to the correct tension as you install.

Go to the PRO desk at Home Depot (or Lowes) and take the part with - they can likely order it.

http://www.homedepot.com/b/Hardware-W ... Repair-Parts/N-5yc1vZc2em

You likely could also find it yourself on ebay or amazon --when you find parts like it call the company that makes the parts - they will help you or know whose parts they are. Be nice and thankful - you are not a high profit item.

Can anyone recommend someone who is able to replace window balances?

I have a window that will not stay open. Need to replace spiral balances on one window.