There is a good offer on at moment in Bagram airport arrivals foyer - BTali One-to-One, package comes complete with solar charger etc etc and fairly cheap rates.
VodaTal kill-as-u go and Virgin freedom also have good packages at moment, contact your local Alliance rep. Good news on Top up cards, most shops are open 6-til-Late that sell a variety of papers, mags, sweets and ammunition should you happen to run out.
Good luck boyos
