Personally, I think you're a little steep for both quantities.
If you can get that, good for you, but if someone on their end happens to ask a label maker company, they might be surprised that these as you put it..... cheap vinyl-short term labels can be gotten for very little each or less... you might lose your best customer if they start shopping you.
When doing things outside of your norm, your sign prices can't remain in your known area unless you are willing to lose the deal. However, in losing this deal, you might lose a good and frequent customer together.
Be careful, when traveling outside of your comfort zone.