Planted some blueberries...need help

[Tundra Gypsy]

I just planted some blueberries and read that they like acid soil. Other than adding sulfur from a bag I got at the nursery, what else can I add to the soil that will provide some natural acid making soil??

[naturallysweet]

Wood chips or sawdust. Preferably partly composted

[Jackpine Savage]

pine needles

[Lynx]

Coffee grounds. I've heard you can get buckets of them from Starbucks, but that may not be true any longer. Worth checking though.

[Martinhouse]

I mulch both blueberries and azaleas with pine needles (pine straw). No need to spend money to provide the acid they like.