The market has 2 differences on express against other servers:
1. The tech auto sale price is $1000, instead of the normal $500.
2. You choose how long your tech stays on sale on the market, between 2 and 30 hours.
Other than that the market is the same as everywhere else, and its prices are governed by supply and demand as on all other servers. The prices we normally see favor techers because of the many bots and the kinda short reset in terms of turns given in total. CI is the second best strat.