Send e-mail to guys at Baikal and ask about their stock / next batch.  

I agree with the fact that is doesn't make sense to pay extra buying from alibaba or ebay.

Have you tried deleting cookies and maybe a different web browser (for a test) ?

Those are just some rumours without technical understanding.
Antminer S5 is only able to handle SHA-256 hash.
So it is only able to mine Bitcoin, Peercoin, etc.

And take my miners for more example.
AvalonMiner 721: SHA-256
Antminer R4: SHA-256
Antminer S9: SHA-256
Antminer S7: SHA-256
Baikal Mini Miner: X11, X13, X14, X15, Quark and Qubit

Yes.

My GUI is showing ok.

And yeah, block seven minutes ago  https://blockchain.info/block/00000000000000000016c6ec24d3c86b9a4688f52f4d6a39151220a16e67fbd6

Devices you are talking about don't support X11 algo.
For example Antminer S5 is only for Bitcoin or other SHA-256 cryptocurrencies.

Baikal and PinIdea are manufacturing miners for X11 algo.

http://www.baikalminer.com/

https://shop.pinidea.io/

Damn there is already a second version coming and I have still not seen anything for sale at Bitmain.com 

My A721 works just fine at Slush as it is.

Controller help https://canaan.io/question/how-do-i-connect-an-avalonminer-721-and-avalonminer-controller-including-raspberry-pi-1-2-and-3/

Other frequently asked questions https://canaan.io/faqs/avalonminer-721/

You don't describe your problem so specifically but read this first: https://enshop.bitmain.com/files/download/AntMiner%20S9%20Installation%20Guide.pdf

This is also useful info http://www.dogiecoin.com/bitmain-antminer-s9.html

You could have better results selling it at the computer hardware section of this forum.
https://bitcointalk.org/index.php?board=75.0

Actually it is:
Giant = 900 Mh/s = $2380 = $2.644 per Mh/s

Quad = 600 Mh/s = $1200 = $2.0 per Mh/s

With current prices it indeed makes more sense to buy the Quad miner.

Mini miner: http://www.baikalminer.com/ShowProducts.asp?id=466
Quad: http://www.baikalminer.com/ShowProducts.asp?id=467
Giant: http://www.baikalminer.com/ShowProducts.asp?id=468

1. You will notice the additional 12.5 +. BTC on your wallet.
2. Check the FoundBlocks at the miner status page.

Ask them. 
I had one S9 non-autotune 550Mhz hash board repaired at Colorado and it cost me 175 USD plus shipping.

Can you see one hash board with zero hash rate in the miner status page? It is possible that you have a faulty board and need a warranty repair. If your S9 is bought after October 1, 2016 you need to ship the whole unit to Bitmain for repair. Miners after October 1, 2016 have a 180day warranty.

Thank you! Happy to help 

AvalonMiner controller is actually Raspberry Pi 3 inside their custom case.

Check these links out, you can burn the firmware image to the SD card by yourself if you have a SD card reader to use.
Just follow these instructions available at https://canaan.io/question/how-do-i-connect-an-avalonminer-721-and-avalonminer-controller-including-raspberry-pi-1-2-and-3/.

https://www.amazon.com/CanaKit-Raspberry-Clear-Power-Supply/dp/B01C6EQNNK/ref=sr_1_4?s=pc&ie=UTF8&qid=1489091034&sr=1-4&keywords=raspberry+pi

https://www.amazon.com/SanDisk-MicroSDHC-Standard-Packaging-SDSDQUAN-008G-G4A/dp/B00M55C0VU/ref=sr_1_1?s=pc&ie=UTF8&qid=1489091298&sr=1-1&keywords=8gb+micro+sd+card  
(this has SD adapter with it)

https://www.amazon.com/AmazonBasics-USB-Male-Micro-Cable/dp/B01EK87A82/ref=sr_1_1?s=pc&ie=UTF8&qid=1489091605&sr=1-1&keywords=AmazonBasics+USB+2.0+A-Male+to+Micro+B+Cable    
(in case you don't have one for the AUC3 adapter)

This list contains basicly the same hardware as here https://canaan.io/product/avalonminer-controller/

Total cost 62.48 USD with free shipping in the US

They shipped my repaired 8.7Th/s unit back with newer firmware version December 9.
Temps are better (lower) than before.

December 2 firmware version is the newest one available at Bitmain.com at the moment.
I asked about download link for the December 9 firmware to update my other 8.7Th/s unit which has high-ish temps, but they said they are still testing it.  
They said that it will be available at the support page when it's ready.

Well then you can go and use it.

I have no opinion if that PSU is reliable or not.
If it is able to provide output power as advertised and has 10x PCI-E power connectors (at least 18AWG wire, preferably 16AWG wire) , then you can use it.

I have no knowledge about that PSU and you have not given any real info about the power supply, so sorry, I can't help you out.
It is best to use a reliable server power supply or Bitmain's power supply or reliable ATX power supply (EVGA for example).