David, it means it is a Layaway that is only available if you are a Team Buds (TB) Member. Details here : budsgunshop.com/teambuds.php

only Team buds members can put that item on lay away Tb is not a bad deal the cost is $29.95 and you get free layaways a 90 day layaway at buds will cost you $25.00 (free for TB ) budsgunshop.com/teambuds.php

Tab just means for Team Buds members only. It is worth applying for membership, as sometimes, as in your case, you won’t be able to get the item unless you’re a member.