Good question..... probably can't buy blood worms... but some bait shops sell Mud worms as Blood worms.
Hard to did them at the GC.
Gem Bait & Tackle will sell live & frozen ( cured ) worms. you'd have to call them for pricing. 3287 3868
BCF sometimes sell cured bait, so try them............... good luck.
I am thinking you are Whiting Fishing ? I have had good sessions on the cured worms, but obviously live are better.
LP