We are currently using Dymo 450s for checkin and are looking for a vendor for label stock. Does anyone have a vendor/product that they are happy with from a price/performance perspective? Our current labels have not been sticking well 
Thanks in advance for your help!
We’ve had pretty good luck with these from Amazon: Spartan Industrial - Compatible Labels Replacement for DYMO 30256.
We were purchasing labels from LabelsDirect for our Dymo 450s and were pretty happy with those for checkin.
We’ve moved to Brother QL-800s and are currently sourcing labels from Betckey (since we use a color label, not just white) and while they are adequate for checkin, they don’t seem to have as strong an adhesive as those from LabelsDirect.