confirmations on some points that wasn't 100% clear to me prior to doing this trade:
1) Commissions -- IB's direct commissions on US fed treasuries is 0.02% of face value with a $5 minimum. Effectively what this means is that if you buy less than $25k, you're paying $5 commissions. If you want the 0.02% to match $5, then you need to trade at least $25k to optimize commissions. They have a price break at $1M, but I'm a bit short of that. Also I wanted to do a small amount as my first bond trade, so I did $25k.