The gamesmaster can establish the availability and asking price for most commonly available goods or services using the Consumer Guide. Characters can always try to bargain with suppliers.
To find out if the characters succeed in striking a good bargain, test against their Fel; a successful test indicates that they have been offered a lower price. Price reductions are at the GM's discretion, but 10% can be regarded as usual - more for an especially good (low) roll.
Ale houses and eating establishments are not likely to offer a discount and staff may get very annoyed if the players try to bargain with them.