High Velocity Body Armor
Tom; I'm not sure what the rules are for product-marketing on this website, so please remove this post if it's not appropriate. Having said that, I'm not affiliated with High Velocity in any way. I just ordered a set of their body armor (more information) and will throw up a review as soon as it arrives.
The reason I'm posting this is because I stumbled across a nice deal after some Googling. If you order through their regular website, the armor is 170 US dollars, but if you order through this link it's only 130 US dollars. Make sure you order through that specific website though.
I'm not sure how long this offer will last now that other websites besides Squidbusters know about it, but maybe somebody will find it useful.
To get the proper size, compare the drop-down menu contents on the Squidbusters website with the size-chart on the High Velocity website. Measure around the chest, underneath the armpits. Breathing in or out doesn't matter (according to High Velocity).
Cheers,
Jaap
Edit to fix url.