$500 Helios:
Symphonium Helios | Headphone Reviews and Discussion - Head-Fi.org
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Sick deal indeed 
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If it’s used by Aoshida-US or Hifi-College they both have 1 year warranties and excellent support via the Amazon merchant shipping system (no returning to China) locally. SMSL Factory store does too, but I haven’t done a claim with them as to how they accept warranty issues. Amazon Prime day is just going to be no name brand overstock like every year. Might find something here until the 11/11 Black Friday stuff starts hitting for deep sale prices.
Hart Cables has a 20 percent off everything sale for their 5 year anniversary.
Discount code HAC5YEAR
Gustard R26 Discrete R2R DAC used $989
https://www.amazon.com/Gustard-Discrete-Decoder-Streamer-Renderer/dp/B0B53FJ8P9
Topping D90 III Sabre used $764
https://www.amazon.com/D90-III-Bluetooth-ES9039SPROx2-PCM32bit/dp/B0CQJYWMJZ/
Topping D70 Pro OCTO DAC used $449
https://www.amazon.com/Topping-D70-Pro-OCTO-DAC/dp/B0CGCQC2QT/
Topping PA7 Power Amplifier used $336
https://www.amazon.com/KGUSS-PA7-Amplifier-Balanced-Black/dp/B0C2TLM9W5/
Topping D70PRO Sabre DAC used $559
https://www.amazon.com/Topping-ES9039SPRO-Bluetooth-Display-Decoder/dp/B0C4PM29NJ/
Topping DX9 used $1000
https://www.amazon.com/Topping-DX9-NFCA-Headphone-high-Performance/dp/B0CL6FFLL7/
Topping A70Pro $399
SMSL C200 Combo used $109
https://www.amazon.com/C200-Headphone-Amplifier-ES9038Q2M-4xOPA1612/dp/B0B9391B45/
SMSL D400ES used $384
https://www.amazon.com/S-M-S-L-D400ES-ES9039MSPRO-Decoding-Bluetooth/dp/B0BLGWBPH3/
SMSL D400EX used $699
https://www.amazon.com/S-M-S-L-D400EX-Certification-AK4499EX-Flagship/dp/B0BLCFG7ZP/
S.M.S.L H300 used $199
https://www.amazon.com/S-M-S-L-H300-Headphone-Amplifier-Headphones/dp/B0C7W5V1JW/
SMSL DO200 PRO used $319 or $60 off coupon for new ones
https://www.amazon.com/CS43131-Balanced-Optical-Coaxial-Bluetooth5-1/dp/B0D1V9LRY4/
ADI2 DAC FC All in one used (like new) $1047
https://www.amazon.com/Ultra-fidelity-Channel-Converter-Headphone-Amplifier/dp/B081CWQXGD/
SABAJ A20d 2022 used $279
https://www.amazon.com/Balanced-Headphone-Amplifier-ES9038PRO-Bluetooth5-0/dp/B09YXPKSTD/
S.M.S.L SU-9 PRO DAC used $399
https://www.amazon.com/S-M-S-L-ES9039MPRO-Decoder-Bluetooth-High-Res/dp/B0BJV9K367/
These are direct from Creative so they come with warranty, free shipping, and didn’t charge tax last two times. Just in case there’s some gamers out there, or on a budget.
Soundblaster AE-9 $215
Soundblaster G6 $70
Sennheiser Momentum 3 wireless new $99. I bought two and they’re brand new with 2 year warranty (Woot is owned by Amazon)
SMSL AO200MKII Power Amplifier used $186
https://www.amazon.com/AO200MKII-Amplifier-MA5332MS-Amplifiers-Subwoofer/dp/B0CCVBZS9R/
Topping D30Pro DAC used $254
FiiO K19 Desktop DAC/Headphone Amplifier used $1009
TOPPING D70 Pro SABRE DAC used $559
Sennheiser Outlet has a lot of good prices on things these days, just too many to list individually.
Drop still has the Topping DX5 for $219
And they’re still destroying the market with the A90D for $399
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