Nuforce HP-800's $149.00. They also make very good quality Headamps/DACS! They just a sale on some of them, not sure what in there now?
You can get an entry level ICON amp/DAC for less than $100 and a refurbished one, if available, for even less.
You don't necessarily need an amp for them, but ANY Can worth purchasing is ALWAYS going to benefit from one!
I know they are a NEWER company, but I would recommend you go on the website (you can purchase straight from the adjoining E-Store) and read the reviews and awards they have received over the recent years and you will see Y I am recommending them!
I just purchased a pair and prefer them over my old AKG 701 Quincy Jones'. Hard to believe, but what is the old adage? "Hearing is Believing"
Google: Nuforce..... Easily found!