For that low price, you want to first look for an inexpensive existing Cobra in the for sale section here and in CobraCountry.
If you cannot find what you want already built, check out the list of manufacturers on this thread. I recommend quite a few, but they should be local so you can drive over and visit the rep.
In the low end kit segment, you cannot go wrong with FFR and some others that will be recommended on this thread - good luck in your search.
List of Manufacturers