We are excited to be jumping in, too! We haven't done any stocking up. I figure if we're sill using q-tips & other health stuff, then I'll buy them as needed. We will avoid big box stores though.
I made one last trip to Target a few days ago to use a Christmas gift card for my daughter. I loaded up on crafty stuff and a storage container to store them. The storage container made me pause since I'm sure I could find one used that would work. It snaps and stacks with one we already have though, so it felt like an okay last pre-compact purchase.
It did feel good to pass up all of those 50% off end caps. It is freeing to realize I don't NEED any of that stuff!
When we started making our our exceptions list, I thought it would be excessively liberal. It ended up being surprisingly short though:
Supplies for making a placenta print. (If I ever get around to defrosting it and making a print, I'd like to have acid-free paper.)
Others, only if they can't be found used:
Vegetable gardening materials
Home repair supplies – lots of internal remodeling needs finishing, plus external painting and a partial new roof.
One particular bike part my husband doesn't think he'll be able to find used.
We've also decided to eat out or order in once per week at a local restaurant. That's considerably less than usual for us.