Where can I buy baby stuff?

I have a 5 month old baby girl, and I want to get a few things for her, but I don't know where I can find them and how much they are. The first thing is a bumbo seat. Second is a safety first bath tub seat(with suction cups to stick to the tub) and the third is a floppy seat(shopping cart cover). I know I can get them at walmart, well, the floppy and bumbo, but every time I go there, they are sold out of the pink bumbo seat, and the floppy seats at walmart are too bland. I want a pink one for her. Oh, and if you know the prices, that would be great! Thanks to everyone who takes time to answer!