Is it the BEER that is desired, or the bottles?
I haven't seen beer in... plastic bottles, I don't think although large liquor stores in major centres have more product that can be browsed esp. during COVID-19. So I'm not sure. There USED to be "brew your own" craft beer shops and they had a supply of reusable -- at least I used them over and over -- brown... plastic... bottles that resembled, ah, 1960's (smaller than today) little round beer bottles. Not sure if they are still around but they got them from SOMEWHERE, right?
Beer keeps well in empty plastic liquor bottles, but go for the ones with plastic caps (OTTOMH, like maybe Southern Comfort?) as there is a weak spot with the design of the ones with metal caps - if you whack the cap or drop it on a hard surface the soft metal dents very easily. )-:
The best small plastic bottles that I have seen in Toronto are used for "Chubby" soft drinks which is this horrible liquid possibly made by Cott Beverages in Hamilton. Some of the flavors will taint the plastic slightly, esp. one that is made in Trinidad and is shipped here for some reason. Green caps.
A domain that I want (jsn dot com if you must know) is used by a California based manufacturer of various plastic containers.
I would also try a lab supply house like Cole-Parmer in Chicago... they have a lot of weird stuff.