Price: $109.50
Don’t pay over: $109.50
Description: Baby of the C&C amp range, just got better.
Features: Gain control, Bass control, Sound stage compensation

Good at: Everything it would seem.
Don’t be fooled: This is a true upgrade from the popular C&C Box amp. Unlike revamped headphones, the difference is more than cosmetic.
Rivals: Little Dot MK I Portable headphone [...]

Price: $169.00
Don’t pay over: $169
Features: Built in Dac, Gain control, Sound stage control, in built rechargeable Lithium battery.

Description: The most original and stunning (if not weird) looking headphone amps on the market today.
Good at: Just plug your headphones in, look at it and enjoy the beauty.
Don’t be fooled: Its not all beauty, it can [...]

Price: $65
Don’t pay over: $65
Producer: Headphonia
Features: 9-18V DC external wall adaptor, AD8397 high performance opamp , LM6171 ground driver, detachable bass boost (8dB), gain adjustment (3x/8x), trickle charging using LM317 constant current (30mA)
Description: RollsRoyce of Cmoy amps. That’s not to damn the other producers with faint praise.
Good at: Build quality and features.
Don’t be fooled: Like [...]

Varying availability. They are hand made after all!
Price: $49
Don’t pay over: $49
Producer: Biosicencegeek
Features: OPA2227 OpAmp chip, Auto power on, Dual Gain Switch

Description: Good amp, with a myriad of options. I love the ‘Auto On’ feature and the dual gain switch.
Good at: Features
Don’t be fooled: by comments that CMoy amps are made by inexperience amateurs. [...]

Price: $59
Don’t pay over: $35
Description: Stylish product form a well established manufacturer
Good at: Small, stylish accessory
Don’t be fooled: The headphone community shun Boostaroo
Rivals: Fiio E3 headphone amp - style and size, CMoy amp - sound
ebay: Starting from $34.99. Usually plenty available for your bid.
Replacement parts: N/A
Mods: Decent cable wouldn’t hurt
Reviews: Amazon reviews

Boostaroo Revolution Review

Goodness knows [...]