Are you wanting just a simple bore light type,, or a rod insert with a magnified, lighted inspection mirror type like the Hawkeye?
The Hawkeye is a popular model,, but as noted, not inexpensive.
MDS sells one,, (or used to,,) that was half the price of the Hawkeye.
Lastly,, a Lyman is out there,, and it's the least expensive,, and comes with it's own viewfinder. And it can download to a SD card.