There is an online version of the Scott catalogs, however the interface is clumsy and Amos Media STILL insists upon pricing it using the old school per-volume model. There is no annual subscription. You can buy SOME countries ala carte though. However, if you collect a country that is not one of the ones that they offer individually, your only option is to purchase the entire volume.
Beyond stupid.
http://scottonline.comWhat I've done instead for undividual countries is to purchase individual country printed sections from
https://scottcataloguepages.com/ (he buys Scott catalogues and breaks them down and resells the individual countries... a service that had Amos Media any sense they would offer themselves) and then scan those in to PDFs and OCR them.