I don't play in Glasgow very much at all as I tend to play in Edinburgh now but from my experience it's only £1/£2 that seems to run.
If you're looking to play a live cash game in a casino and not risk too much (definately a good idea if it's your first time playing live properly) then this casino offers 25p/50p tables. I have no idea how often this runs though:
http://www.gentingcasinos.co.uk/casi...glasgow/poker/
The Alea is pretty good for cash and tournaments with cash games running most nights. I haven't played in the Gala Merchant City much either though I played one tournament there and it has been renovated and doesn't look a complete dump anymore!
If you're able to travel I really do recommend the Genting Club Fountainpark in Edinburgh - it has 50/50p cash games running every night and is probably the best run cardroom in Scotland.