i use omnis.com. $8.95/year. They will gently try to sell you hosting and privacy controls - I gently ignore them. With bulk, it's down to $8.70/year IIRC (and lower, I just don't have that many there). The bulk of my domains are there now, and I will probably have all there by next year.

It's not the best interface, but the price/performance is fine, and I don't have to go hunting for coupons every few months. They've not modified prices in the 2+ years I've been there.