Just curious
Not much, was a small set. (249 cards). {Truefire paladin} was like $1 each in the beginning. Not much help, sorry.
Best I can do to help is click on the truefire I linked, tap the gatecrash - uncommon, click browse expansion, click act of treason and tap the right arrow looking at each price on the way. Seems tiresome but other than that I don't know how to check quickly for prices.
Unfortunately, there's not a whole lot of value in Gatecrash at all :-\
Value??? Cash value you're right. But utility value, gatecrash is awesome.
{Boros charm}
{dimir charm}
{simic charm}
{Orzhov charm}
{gift of orzhova}
{rapid hybridization}
{experiment one}
{thrill parasite}
{wasteland viper}
{duskmantle guildmage}
{burning tree emissary}
{cartel aristocrat}
Also {Ghor-Clan Rampager} :)