I realize you can go to the pain in the ass spreadsheet and try to find upgradable titles and barcodes but I have found this is not the most user friendly way (there is a lot of outdated information there which leads to aimless searching).
Contributing to this thread with high value upgradable titles and corresponding barcodes. Would love to see others add their recommendations on barcodes they got to work (please post barcode with high value recommendations as this is the biggest pain in this process as there are multiple barcodes for different movies but only a fraction of them are recognized by Vudu as being eligible for a disc to digital upgrade).
-Ash vs The Evil Dead: The Complete Series HDX (Seasons 1-3) $1.99
https://www.barcodespider.com/031398290940
-Black Sails: The Complete Series HDX (Seasons 1-4) $1.99
https://www.upcitemdb.com/upc/031398295969
-The Terror: Season 1 HDX $1.99
https://www.barcodespider.com/031398290582
-The Walking Dead: Season 8 HDX $1.99
https://www.barcodespider.com/031398285489
-The Hobbit: An Unexpected Journey (Extended Edition) HDX $1.99
https://www.barcodespider.com/794043168215
-The Hobbit: The Desolation Of Smaug (Extended Edition) HDX $1.99
https://www.upcitemdb.com/upc/883929416394
-The Hobbit: Battle Of The Five Armies (Extended Edition) HDX $1.99
https://www.upcitemdb.com/upc/883929477142
-Kingpin HDX $1.99
https://www.upcitemdb.com/upc/32429149213
-Home Alone 1 & 2 HDX $1.99
https://www.buycott.com/upc/024543673170
-Kung Fu Panda HDX $1.99
https://www.upcitemdb.com/upc/24543238584
-Kung Fu Panda 2 HDX $1.99
https://www.upcitemdb.com/upc/24543238546
-Last Of The Mohicans (Director’s Definitive Cut) HDX $1.99
https://www.upcitemdb.com/upc/24543657880
-John Carpenter’s The Thing HDX $1.99
https://www.barcodespider.com/025192193194
-Mystery Science Theater 3000 The Movie HDX $1.99
https://dvdupc.com/movies/B00D7AM6B6/mystery-science-theater-3000-the-movie-bluraydvd-combo-blu-ray
-Fido, 2006 (Horror/Comedy) HDX $4.99, SD $2.00
https://www.upcitemdb.com/upc/31398218807
-Sniper, 1993, Tom Berenger HDX $4.99, SD $2.00
https://www.upcitemdb.com/upc/43396707597
-The Gods Must Be Crazy HDX $4.99, SD $2.00
https://www.upcitemdb.com/upc/43396061088
-Defendor, Woody Harrelson, HDX $4.99, SD $2.00
https://www.upcitemdb.com/upc/43396342941
-George A Romero’s Land Of The Dead, HDX $4.99, SD $2.00
https://www.upcitemdb.com/upc/25192870224
-Waiting For Guffman HDX, $4.99, SD $2.00
https://www.upcitemdb.com/upc/53939252620
-Tresspass, Bill Paxton, HDX $4.99, SD $2.00
https://www.upcitemdb.com/upc/18713810069