I purchased my most recent bale from Josh's Frogs...3Kg bale...price very reasonable...good stuff.
New Zealand Long Fiber Sphagnum Moss (3kg 240L) - Long Fiber Sphagnum Moss | Josh's Frogs
If I don't need much and/or I'm getting something "special" then I will sometimes buy it from repotme. They have really good stuff too...comes pre-wetted and fluffed...but you pay extra for that convenience. Repotme carries some of the other stuff I use so there are times when it's just easier to do one order at one place. Repotme also have good turn around on shipping and fast delivery and they carry items that no one else does.
Orchid Supplies from rePotme.com - Orchid Mix - Orchid Pots - Orchid Care - Orchid Fertilizer
This past time I needed a LOT so I went w/Josh's. It was my first time ordering from them...I'm happy w/the quality as well as the turn around on the shipping.
Across the board, NZ sphag has gotten more expensive and (to be frank) a bit harder to find than it was even 3 or 4 years ago. Not sure why...it's just the way it seems to be.