yeah, that's way too high at least for me. when i first got my 175's i did a trade with a guy on here. i traded a wireless access point and a card for a complete setup. bulbs, mogul sockets, quick disconnect cords, ballasts, reflectors, etc. something i had and wasn't using.
for the 250's i just got i was just lurking around and saw a post on the for sale for it and i jumped on it once i saw it.
definitely cheaper than buying brand new. i'm more of a DIY type of guy except on some things.
you could always just post a Want To Buy ad on the For Sale forum as well. You'll get a ton of responses. Probably more than you'd want. Alot of people break their tanks down when moving and sell or they get out of the hobby all together. Good deals out there if you just watch.