Yes! If you have a benefits card associated with your HSA or FSA plan - be it debit or credit - you can use it to purchase an Ava.
Contact your FSA / HSA Administrator to be absolutely sure that you are covered.
If you have an FSA / HSA account but don't have an FSA / HSA card, you can still use your credit or debit card to purchase. Remember to print your receipt and submit your claim to your FSA / HSA Administrator for reimbursement.