I started doing item reviews on Youtube, can I write off the items? If so, how much? If I have to use the depreciated value, how do I determine that value?

I've started doing fashion related item (i.e purses and shoes) reviews on Youtube & have yet to see a profit (because I have yet to get 10,000 views), can I write off the items I review? If so, how much can I write off (the actual price of the item or the depreciated value)? If I have to use the depreciated value, how do I determine the depreciated value of an item?