Where are you?
Plenty of GAS STATIONS sell head gear here.
I don't recall if I've specifically seen glass tubes anywhere (gas stations) though.
(But the other 60,000 head shops in this area all have one OZ tubes all over the place.)
there is a guy on ebay that shows up every once in awhile with like 80-100 gram tubes legit for 30$ or so. im sure you can search the completed listings and find him....
i have a 112g tube and a 14g tube lol i need one in the middle that state im in its not as easy to finf supplies bc the medicinal bill isnt in effect yet
haha thats alot of filler and has crossed my mind but as it turns out i only keep one gallon of blasted material in a storage jar then burn . just did a burn last week i have nothing besides filters much rather have a 28g solid tube bc alot of my clients ask m eto use one ounc of their favorite nuggets more for convenience then anything