I think would be good if u can provide details such as
-what brand and what model? just say japanese brand is not enough since there is a lot in the market....also bear in mind to check is it genuine and original product
- wiring, what type of wire (the brand, size), power cable and grounding
- the amp usage - to power up just speakers/component/woofer/both?
The price might be good deal if it really suits your need and might be the other way round.
also just an advice, not just focus on the best deals, but also focus on the amp spec does it suits your expectations, the usage ( either to power up component/woofer). The price quoted my assumption which include wiring and installation might probably just an entry level amp. (just my assumption from my piece of experience!!)