but the main issue with some/most of them is the fact that they don't seem to offer similar promos when Trezor is offering some and to rub salt into the wound, the usually charge higher prices than the manufacturer [it differs from country to country, but IIRC someone mentioned paying double the price in comparison to prices shown on Trezor's shop].
This is understandable. They purchase their devices directly from manufacturers at wholesale prices and have to offer it to customers at a higher price to remain profitable. The manufacturer can afford to offer discounts and special promotions but that's not the case for a physical shop limited to a smaller circle of customers. At a discount they make nothing or very little. Trezor sells their products globally and anyone can purchase them online. Their userbase is much bigger. No one is going to buy from a physical electronics shop in city X except the people close to them.