Which DAC makers let you do in home trial?

An R2R DAC done well is more expensive to make. It's just the technology. I wouldn't say  overhyped nor over priced since it is  costly to make a good one. . In my opinion if I am using a tube amp I want to feed that amp the clearest distortion free signal I can since I want the sound of the tube amp coming through. Tube DACs add their own coloration, some like doing that , I don't  it's a preference thing. I would rather use something like a Benchmark DAC3 which is a very neutral DAC. Some will probably chime in on getting a NOS R2R DAC which is non over sampling. You might prefer it, some people do but once again unless done well with proper filtering they can be noisy on the analog output so you're not sending a good clear signal to your preamp or integrated. If you can try different ones do so and see what you like its your system,  room and hearing.

iFi products are available around (e.g., Music Direct) with 30-day returns.  

Audio Mirror's baseline model (Tubadour III) has a home trial period too (7-10 days I think).

And I'll have to respectfully disagree with @djones51.  I demoed the Audio Mirror (special edition) against a Lampizator Amber 3, ifi iDSD pro, Matrix X-Sabre Pro, Shiit Bifrost 2, and PS Audio Directstream DAC and ended up with the AM.  It's a NOS R2R DAC.  It was the most musical DAC in my system (Don Sach's 2 Preamp, First Watt F4 monoblocks, Coincident PRE speakers).  I liked the iFi the second best.  

Thanks, for both of your opinions and elaborations. Even when folks disagree, I learn what's relevant. 

I do not recommend a limited time ’demo’ or ’audition’ given where you are in your journey.

Commit to a DAC. Live with it. Optimize it. LEARN. And Enjoy it. Move on only after you have learned as much as you can and have figured out where your path leads next, at that point in time.

+1 re. @cal3713 ’s point on NOS R2R DACs.

There are a number of examples that have worked well for numerous and varied members [within your specified budget].

They can be Solid State (and I would choose solid state)...to @djones51 ’s valid point regarding best pairings / synergies, SHOULD YOU follow the DAC with tubed amplification.

Anything that Crutchfield sells comes with a 60-day trial.

The new Topping D-90 has outstanding measurements & has gotten great reactions from early users. I'd be tempted to try it, at $699. Available from Apos with a 30-day return. Benchmark also has a return period, I think 30 days.