No, that's the cheapest fare available for your dates, so it is pricing correctly. The cheapest availability through IAH for your dates is an H fare. It would get you 8 EQP and 150% EQM for your extra $230. If you want cheaper you'll just have to wait and hope availability opens up (and that's peak season, so I wouldn't bet on it getting that much cheaper.)

Seems like you have two issues really - 1. co.com wouldn't even tell you the price for the flights you want. and 2. it's much more expensive than you want when you do force it to tell you.