Go to Amazon, the BX5 H standard battery is only five bucks each with free shipping from one of the non-Amazon sellers, and the reviews seem pretty positive. But, anyone know how you can charge 3 batteries without having three phones and cables?
Simple really...charge each battery in the one phone. Average charge time on my battery from fully dead to fully charged via the wall outlet is about 2 hours or so... So about 6 hours total to have all 3 ready for use...then buy a stand alone battery charger for about $20 out do on Ebay or Amazon...
I don't know what they have on ebay for the X but for the D1/D2 you can get a wall charger for 5.00. Also my old Blackberry Storm charger works perfectly. Add my D1 which I still have and I never have a battery issue. GPS up all the time.