How do I know I'm pricing it right?


I’m a new seller as of December, and I’ve come to realize that it’s normal for it to be slow this time of year. One can help but wonder though: am I pricing my gig too high? My main concern is my “custom invoice template” gig. Basic is $75 and premium is $175.
My shop pays $150ish for a stack of carbon copies. We haven’t switched to computer printed because, well, the boss is old school.
The service I offer may be easy to those that are computer savvy, but savvy or not, it IS tedious and will pay itself off in no time. Not to mention made to the buyers’ satisfaction.
That being said, i need feedback. Is it priced right?