I use a down MEC Merlin (-3 or -5°C) that weighs 824 grams including compression sack. I paid around 220$ CAD and was refunded half. Some bags were under filled so they offered to return it or a 50% refund. I've used it down to about -10°C on top of a NeoAir Xtherm.

Massdrop has nice quilts made by Enlightened Equipment.