If 90% of Braun's funds are self-financed as Cal said, then that would put his traditional fundraising figures at ~200k. Which would still mean Donnelly is outraising the Republican field through traditional fundraising. A bit over ~1mil for the Republican field and ~1.2mil for Donnelly is encouraging numbers.
I'm not saying that Braun's self-fundraising should be ignored, it's very clearly a threat. But I don't think we should act like Donnelly's fundraising is suddenly awful because Braun has more personal wealth to juke up his own numbers.
Here's percentages breaking down donations and self-financing:
https://www.opensecrets.org/races/candidates?cycle=2018&id=INS1&spec=N Braun has raised less than $400,000 from donors and has loaned his campaign over $3 million since announcing. Donnelly still has over twice on-hand what Braun does, though.