$8.95. It was nice the few times I flipped an $8.95 purchase into $100 sale days later. Been awhile though.
The most that I've paid is around $300. Personally, I prefer hand regging names unless there are very nice names in that I can buy for cheap to resell down the track, otherwise just a fresh reg gives me a better ROI
Got stuck paying $100 fee to recover after a grace period on one that had expired on me. Other than that, just the base rate from the registrar. Buying an already registered domain is kinda like buying used underwear... there is not way to know if it is clean.
Paid once $49 for a .com domain 1.5 years back. Its worth for me. After that always buying at normal price through diff.-diff.domain registrars. DON.