There's an official TIM shop in Bressanone/Brixen, one of the first exit on the motorway after the Austrian border.
Here are the details:
IL TELEFONINO
Via Mercato Vecchio, 8/c
39042 BRESSANONE BZ
Tel.: +39/0472/834473
The problem is that it's in the centre, and I fear it's a pedestrian zone.
There is another TIM shop (not flagship) here:
AUTOMUSIC
VIA VITTORIO VENETO 28/1
39042 BRESSANONE BZ
Tel: +39/0472/831888
Via Veneto is beside the motorway and surely it's not a pedestrian zone.
You can take a look on
ViaMichelin for the route.