Hi Zhan!

I'd have to disagree with your use of mycorrhizal fungi with blueberries. Unfortunately, blueberries is the one of the very few plants that mycorrhizae has no effect on.
Drink coffee? mix your used coffee grounds into the mix (fresh coffee grounds is too acidic.)
as for mycorrhiza, the leaders i've found is reforest.com/extreme_gardening.php their website isn't great, (a little hard to navigate) but they have some good info. also, they don't sell smaller quantities directly from the site (which is stupid) but email or call them if you need anything, and they'll help you out, on just info alone.
also, planting multiple species of blueberries will increase yield.

Alan