We will not be responsible for any issues with barcode scanners, but we have good experience with this one:
This is just an example with one supplier. We don’t have any connections or relations with this shop.
It works with PC/Mac/Android/IOS. Can be used with USB cable, Wi-Fi or Bluetooth.
We can also recommend scanners from Socket Mobile. They are using iPacky themselves to fulfill their orders.
If you want an all in one device, have a look at these Munbyn mobile phones with scanner