I have worn my Fitbit everyday and it continues to work, but I need to replace the band. I don't need a Charge HR. Can I just get a replacement band?

Which model?
You can get replacements here:

Fitbit Store Buy Surge Charge HR Charge Flex One Zip Aria

wrong site need to go on the correct seller site this is fixya

Of course you can do it with a screen protector.
The Guide Of Reset Fitbit Charge HR Complete Guide

the band can not be removed. If it is under warranty (1 year) they will send a new Fitbit. if not, the bubble can be glued with craxy glue.

Fitbit Store: Buy Surge, Charge HR, Charge, Flex, One, Zip ...

https://www.fitbit.com/store

FitbitBuy Fitbit devices and accessories at our official online store for free shipping on $50+, 45-day money back guarantee and 1 ... Interchangeable Bands ... Fitbit Charge HR™. HEART RATE + FITNESS WRISTBAND .... United States (change).

Fitbit Charge HR Review: This Is The One You Want

gizmodo.com/fitbit-charge-hr-review-the-king-of-fitness-tracke...

GizmodoFeb 4, 2015 - The Charge HR, on the other hand, has a standard watch strap with a closure that ... Well, most fitness trackers out there are really just glorifiedpedometers. ... With the HRM, I took my pulse (or had a friend take it) and then check the display. ... Fitbit claims the Charge HR will last "up to five days" on a fully ...

Fitbit Charge HR Fitness Wireless Activity Wristband Review

Go to Ebay and use the search bar. There are lots of them.