If you are trying to measure purchase intent (likelihood of buying) then technically changing any element of the consumer buying process (promotional channel/"offer"/design/brand treatment/etc) can impact the results. That is why CPG companies spend an enormous amount of money using expensive tests to find the same answer.
Given most of us don't and won't have access to such funds a couple of suggestions:
a) See if you can find a strategic channel partner, aka customer, who will do the testing for you as part of their own due diligence in selecting products. May seem far fetched but I have personally seen it happen up close.
b) Set up a website to promote the product, using a variety of prices, starting at the top end. You should garner some comments and if priced right and the product is right and message is right and...then some of these comments should be sufficiently strong to signal acceptance or "denial" of the proposed price
c) Set up a business facebook page with posts on the new product and higher end price and see what reactions are from FB ads that target the segment you think most likely to buy; you can lower 10% at a time to see if it impacts interest.
d) Check out sites that let you post an idea and gather feedback; Mount Dream is one, there are a few others.
e) Use a Kickstarter campaign to test consumer involvement (has been done before)
f) Similar to strategic partner/.channel researching, see if they will let you showcase a couple in the store and see if people are willing to not only buy the few you have but be put on waiting list for next production run; chains won't do this but boutiques may
I am sure there are more options out there..good luck.