We (David and Peggy) are a couple of entrepreneurs who registered about 500 domains circa 1992.
We’ve sold a lot of domains over the years and enjoy helping other entrepreneurs succeed.
That said, these are valuable assets which have annual registration fees we’ve incurred for all these years totaling around $1,000 each. (And that doesn’t even account for any interest/profit on our investment.)
So, unless there’s some very good reason for us to consider less, $1,000 U.S. is the starting point for even the least valuable domains.
Good luck in your acquisition and venture!