I have developed a wellness journal that would be an ideal impulse
item at check out locations at drug stores, grocery stores,
convenience stores....

I would like to find the best way to approach this distribution
channel. Who stocks/sells/services these types of businesses? Are
there any trade associations? Contacts?

Think of phone cards or batteries. They are right next to the counter.
I can create the piece so that it actually looks like it is a store
product.