I live at home with my parents, and I keep my Little self hidden from them. The most they know about me is that I watch My Little Pony, and my mom knows I dabble in cross-dressing, but not anything extreme enough like this. I've bought stuff on my debit card before, and had the packages delivered to my front door. Since we have a communal mailbox, I can get packages discreetly, or by lying. Since they don't get the bills, they usually completely forget about the packages later on.
Most of my Little stuff has been clothes. I've spent a buttload of cash on clothing that I've cascaded into bags hidden in the back of my closet. Usually the hardest parts have been with confrontations though. They might receive the packaging first and ask if I ordered a pillow, and I'd deflect and just say "yes," or "I don't know."
A few times now, I've ordered something, but the fraud department for my debit card would say someone "stole" my card, even if it's for a fairly inexpensive thing like a pacifier. Currently, I have no idea how to fix it other than just fuss at it, and eventually you'll succeed. It is super annoying though, as I've bought numerous things on that card, and yet every time I order something for my Little collection, it either tells me that it's been stolen or it just gets declined.
I'm still working on solving that particular problem when it comes to buying a new pacifier, or AB diapers. I recently learned that pacifiers have expiration dates of about three months each, unfortunately. So my using a pacifier for over two years was very unwise. So I threw it out, but because of my debit card not allowing me to buy a new one, I find it really really hard to fall asleep at night