I'm not quite sure how you define "inexpensive", but I'll toss out a suggestion for what it's worth.
I'm a Birdland dealer, and the now-discontinued Odeon Lite is a very nice little DAC with a volume control. I sold many pairs of $16,000 ballpark Sound Lab electrostats using the $970 list Odeon Lite as my DAC. There are a couple of used units for sale here in the $500 ballpark, which is quite reasonable.
I'm a Birdland dealer, and the now-discontinued Odeon Lite is a very nice little DAC with a volume control. I sold many pairs of $16,000 ballpark Sound Lab electrostats using the $970 list Odeon Lite as my DAC. There are a couple of used units for sale here in the $500 ballpark, which is quite reasonable.