There seemed to be the usual offerings from past years. Signs, garlands, decorative bottles, etc. from the decor sections and ribbons, stickers, and the like in the craft aisles. There are always lots of candles and some of them are nice black ones so this might be a good time to stock up.
I didn't pick up anything this trip because I was staying focused on supplies for one project that will feature on this blog soon (yay responsibility!) but I think I will be back for these Mason Jar to-go cups. They have Halloween stickers that say things like 'vampire blood' or 'zombie virus' and there's one with a skull an crossbones decal (they also came in black, orange, and purple if you want something Halloween like without the sticker.)
This year I think I'll be sticking to crafting supplies mostly because I have a few projects coming up and I don't want to buy a lot of decor when I anticipate that I'll be moving a fair bit in the coming year (spoiler alert.)
I also recommend checking the Michaels website to see if they have any coupons before you go, there are usually ones for up to 50% off one item you buy in stores.
What are you planning to pick up this Halloween season?
ETA: I just visited Michaels again and as of August 1st there's even more Halloween stuff out!