Good locally available GFO Brand?

[asylumdown]

Since I set up my tank I've been using PO4x4 from Reef Interest in my Phos reactor. It's great stuff in that it seems to hit above it's weight for Phosphate removal, but it's not available locally (or even in Canada as far as I can tell), and I end up spending almost it's cost again on shipping. That plus the beads are so small that it fluidizes almost too well - the beads are small enough to flow right through two sponge screens, so every time I turn the reactor on or off I end up with a mess of the stuff in my sump.

I used the last of my last bag of it last night and want to switch brands, but it's been a seriously long time since I've used any other brand of GFO, what are people's favourites that you can easily get in Canada?