Try any pharmacy. Show them a photo or written names if needed.
I know Imported brands like Amlodac are available and cheaper generic strips from GPO (government pharmaceutical organisation)
Show the pharmacist the name of your 2nd med. Theyll know what it is.
Ubon has at least one huge wholesale medical supply warehouse not open to the public stocking everything from kids vitamin c jellies to hospital beds.
The wholesaler also has a normal pharmacy next to Warin Chamrap market.
Sorry, cant help with prices as i get mine for wholesale.