That's too bad, Coiny. :(
One suggestion, for the future, is to research the box dimensions and the item weight before doing an in-store pickup. Not all sites list those things, but you can try looking for the same model at other sites. Amazon.com, for example, is pretty good about listing the product dimensions (box is of course going to be bigger!) and the shipping weight (shipping weight includes the box the item comes in). You could also try contacting the store (email, phone, or online chat if they have it) and asking for dimensions and weight before purchasing.