Buy a big 5kg bag online. They will last a while. For me they cost 100 aud and can be more if you buy a nice one like the gold standard. They are expensive but when you buy them try go get that value.
Mass gainers are full of sugar btw. Look it up even.
The best brand out there right now I tried is good product to be honest gained few pounds but bruh am student cannot afford them every month and after you stop you lose the few gains you made. what brands you use?