Hmmm, I saw your usernick before. You live in Woodlands,
right? Anyway, even if you dun, there's a shop in front of
Nee Soon Camp (transit road, along sembawang rd) that opens up to
7pm that deals with army stuff. Forewarn that you can't use
credit there. I usually do my shopping there seeing it beats
going to beach road as I stay in the north.
There's also a small shop (those "booth" kinda stores) that sell
army stuff in pasir ris interchange. Opens on friday to
sunday only. Great place to get ur stuff before booking
in.
And yes, chevron in boon lay way has an emart which u can use ur
credits.
Hope this helps =)