https://www.amazon.com/dp/B01N4CJL68/ref=cm_sw_r_cp_apa_i_G8ZYXGA5VG3FGX0EEPV1

Hey not sure if you want to try the aniseed one but I bought it from Amazon and it arrived in a week. Much better than the mint one but still not tasty either Gaviscon Advance Aniseed, 500 ml by Gaviscon https://www.amazon.com/dp/B01N4CJL68/ref=cm_sw_r_cp_api_glt_fabc_S6PBE2H4KH9JEF8W2ZVM

Any of these are what people mean when they say Gaviscon Advance. The crucial thing is that it contains roighly the same amount of alginate/sodium alginate per serving.

https://www.amazon.com/Gaviscon-Advance-Aniseed-500/dp/B01N4CJL68/ref=m_pd_aw_di_agl_tdp_sccl_1/140-9612594-3282566?pd_rd_w=5ODx2&content-id=amzn1.sym.e9478a1d-9e4e-4fb0-93df-4bb9545508fc&pf_rd_p=e9478a1d-9e4e-4fb0-93df-4bb9545508fc&pf_rd_r=A97C0HKBQ6Z1W4ZFD8PH&pd_rd_wg=kmCgp&pd_rd_r=01e82e5c-d0f7-4081-bba7-0f8b15d05f63&pd_rd_i=B01N4CJL68&psc=1

https://www.amazon.com/A2Z-STORE-Gaviscon-Chewable-Peppermint/dp/B09VT1ZWL7/ref=mp_s_a_1_11?crid=3P6LYM3BL6OTO&keywords=gaviscon+advance&qid=1676341453&sprefix=gaviscon%2Caps%2C154&sr=8-11

The gaviscon foam tabs from Canada are also good. https://www.amazon.com/GAVISCON-RELIEF-HEARTBURN-chewable-foamtabs/dp/B076Q4G7YZ/ref=mp_s_a_1_1_sspa?crid=S7NGYUFYDN4U&keywords=gaviscon+foam+tabs&qid=1676341680&sprefix=gaviscon+foam+tabs%2Caps%2C165&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzT0VJMEEwRDBVNTBJJmVuY3J5cHRlZElkPUEwMjc1Mzc4QklIU0FKNjhPVjdIJmVuY3J5cHRlZEFkSWQ9QTAyOTE1OTdORUlLNlJITFhYVzQmd2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

Reflux gourmet might be more availabe/affordable depending on what the current prices are.

https://www.amazon.com/REFLUX-GOURMET-Supplement-Indigestion-Intermittent/dp/B086ZYPWQK/ref=mp_s_a_1_1_sspa?crid=16WQ2S2DAMNDH&keywords=reflux+gourmet&qid=1676341774&sprefix=reflux+%2Caps%2C129&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyMEFPTlBRVlk4MTlJJmVuY3J5cHRlZElkPUEwNTQxODMzMzZBVUY2RTNKTFJZVyZlbmNyeXB0ZWRBZElkPUEwMzA1MTc5M1JJNlgyTEtTVkw3SyZ3aWRnZXROYW1lPXNwX3Bob25lX3NlYXJjaF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl

If it works for you it's more economical to diy the mixture for long term use. The upfront cost is greater (but the ingredients make more) so its better to start with a prepared version to see if you like it.There's a recipe on this subreddit.

https://www.reddit.com/r/GERD/comments/a1lpfh/how_to_make_your_own_gaviscon_advance_at_a/

If you can, use this. Only available on Amazon. Is pricey, but is excellent...

https://www.amazon.com/gp/product/B01N4CJL68/ref=ppx\_yo\_dt\_b\_search\_asin\_title?ie=UTF8&psc=1