Paid $80 5 weeks ago for the Seagate 320gb Go Portable at Best Buy and $80 1 week ago at Costco for the Seagate 500gb Portable. I have 2 Wii's now as my old Wii got bricked and I sent it in for repair, so I bought a new Wii in the meantime.
I bought the harddrive for about 100, it was a year or 2 before I bought the enclosure for $30, I then soft modded my wii and sold it along with the hdd/enclourse, 2 wiimotes/nunchucks/m+ for $450 total