I like task management tool GQueues (http://www.gqueues.com/). But the pro version is as costly as $25/mo which is too expensive for me as a student. What's a good replacement to it? I mainly would like its Google calendar integration and reminder via txt messages/emails.
First thing, you got the pricing wrong , GQueues Pro is available for $25 / year(http://www.gqueues.com/pricing). So I think you can afford it easily.
I have tried GQueues and apart from its Google calendar integration I found it lacking in quite some aspects. If you are seriously considering other options, then Toodledo is one of the best task management websites present out there. Their UI is a bit quirky, but once you get a hang of it, then it's really useful. If you are following GTD by any chance then Toodledo will be perfect.
And Toodledo is also priced a bit lower than GQueues, with a Pro version for 14.95$ & a Pro Plus versions for 29.95$.
I think I have done enough advertisement for Toodledo, rest is for you to decide. :)