I tried something like that for a while but I gave up when I added and removed so much in a row.
Sometimes I get a bit lazy with it and don't update it on a timely manner. It got worse after my Zenbook's SSD decided to take a turn for the worse as the Zenbook was rather nice for updating the spreadsheet. Sometimes, I'll just update it using my iPad/iPhone and Smart Office, which works fairly well. My rule is that an item has to lay down on the shelf until it's cataloged, so that way I know what I have and have not dealt with yet.
Although, I've been selling a lot of games lately, so I haven't been nearly as diligent at
removing items from the spreadsheet.
GameStop by me at 5:15 had 10 people in line, but I assume many had preorders and wanted the 6:00 tickets. Target I called guy said non-reserved selection is very limited but wouldn't give a number. Called walmart he said he has half a dozen non-reserved but 3 already in line, this 6.5 hours before they sell them. Only 6!
Are they also limiting them to one per person? Could be really easy to sell out if each person wants more than one!