@YouGoGirl1
Pier 1 used to have wonderful diffuser scents that changed with the seasons. I had a store nearby and would always have a good supply on hand.
Sadly, Pier 1 stores are no more and the online store has a somewhat limited selection. It's best to get them on sale if you can.
While they used to carry the larger bottles as refills, I see they now only carry smaller sizes. I'm thinking of trying some of the pumpkin spice scent which is now on sale. Not sure what their shipping is, but that will be a consideration.
I've tried numerous brands of diffuser oil and....most were a miss for me. At best, most are subtle and have limited throw. At worst, they are undetectable unless you are standing a few inches from the reeds 
I was a devoted candle burner and gave up because no matter the quality, they sooted the walls even if you didn't see soot coming out. I've tried plug ins, sprays, wax warmers just about any scent gizmo known to mankind.
All with the same, limited throw.
In the end, the diffusers were the most economical and least offensive.
Sorry to be so long winded, but I cannot seem to express my thoughts any other way. 