IanCanada released what he is calling estimated pricing for his imminent GB2019, with final pricing coming "very soon".
This tells me he's almost but not quite done with his QC testing of the production run, and therefore can't commit to pricing as yet, but in all likelihood this will be the final pricing:
Estimated GB2019 pricing:
A1. FifoPi 768KHz I2S/DSD/DoP FIFO with isolator and dual XO, estimated $99-(Special price for this GB, regular $135-)
A2. LiFePO₄ pure power supply with 5 output rails (no batteries), estimated $199-
A3. ESS controller, estimated $39-
A4. Dual Mono ES9038Q2M DAC HAT, estimated $85-
A5. ES9028Q2M DAC HAT, estimated $49-
A6. I/V STD standard OPA I/V stage, estimated $35-
A7. Transformer I/V PCB mini KIT, estimated $19-
A8. ESS controller extension kit, estimated $12-
A9. Package of dedicated CCHD957 XO adapter kit lot of 2, estimated $8.9
A10. Package of OPA1622 adapter PCB kit lot of 5, estimated $9.8
A11. 2” double-ended silver plated U.FL coaxial cable, estimated $2.8
A12. 2.5mm metal standoffs for RPI lot of 4 sets, estimated $2.9
A13. LT3042 low noise regulator PCB, free
A14. I/V STD standard I/V stage empty PCB, free
Unfortunately I can't begin to answer questions about all of the above, those answers are scattered across 2 or 3 different threads at diyAudio.com over literally 2 years time (since shortly after his GB2017 ended) so it would be best to ask over there if on the fence about something as the GB2019 will commence very soon, I'd say in just a few more weeks or so.
I'm very pleased the FifoPi (A1 above) came in at $99, that's what I was hoping for and seems very reasonable when considering the original IsolatorPi (with no FIFO or reclocking) was $49, so the $99 for this upgraded and more sophisticated version is great.
I had no idea what to expect on the LiFePO₄ pure power supply (A2 above), and at $199, it ain't cheap when you consider it comes with no batteries. Each 26650 LiFePO₄
A123 Systems cell of that kind is about $14 depending on the supplier. The board takes 10 cells, so $140 + shipping for the cells. I'm not surprised as this is a very ambitious piece with sophisticated hardware and software overcharge/over discharge protection etc... and just a much larger board with a lot of components on both sides. I'll have to think hard about that one, especially since...
The dual mono DAC card itself is reasonable at $85 (A4 above), but the preferred Transformer based output stage (A7 above) comes without the trafos themselves, it's a kit and you bring your own. Good in a sense you can pick what fits your budget, bad in that Lundahls of this type are pricey little SOBs (K&K list the LL1544a at $85 a pop). Also potentially bad is ruining such a part if inexperienced on the do's/don't do's of installing it correctly, I have never built a unit with anything like that and so there is some hesitation there.
Anyway, there is the estimated pricing, with final pricing now just days away on the IanCanada GB2019.