I shoot at Pitt Meadows.
Non-members pay a $10 day fee (membership is $100 a year).
A round of 25 clays is $6 (members can buy 11 tickets for $60)
A box of ammo costs $7
So a non-member pays $13 per round of 25 clays. If you were to shoot 4 rounds of 25 it would cost you $62 including the daily non-member fee.
But like was mentioned, you can make contacts at the club and get ammo for about $60-$65 all in for 10 boxes, you can also join the club and buy the tickets and save there too.
If start shooting a lot, you can consider reloading your own ammo. Reloading isn't as cost effective with the price of lead nowadays but I can reload a good one once load for about $4.25-$4.50 a box (I buy in bulk, at least enough for 5,000 at a time and recently 10,000). I shoot a lot, over 10,000 shells some years so the savings can add up!
Dan