EDIT - PasteBin link, code removed from below.
Which sheet are you using? 5e, and the resources section(s)? GiGs' solution is by far the easiest, but if that's not possible you can search the sections with a script to find the resource.
Of course, that means having a script dedicated to that one operation. Not a huge issue, unless you don't like bloating your script collection.
edit - This script should work, anyway. It's pretty basic, only takes a few arguments, and is currently set up for 5e's resource sections (class, other and the repeating section).
If you're using a different sheet you can add another object at the top following the same syntax as the "r20_5e" object, then change the 'currentSheet' variable to the new one and.... hopefully everything should still function.
The few command arguments are:
--char can supply a name (exact match, not case sensitive), an ID, or sel (for selected token). Can use either --char|sel or just --sel for the selected token
--name the name of the resource you're trying to find (e.g. arrows, bolts). By itself, --name will just report the current/max values.
--mod what you want to do to the value. pretty basic so far +X, -X, or just X to set a straight value. + and - only work with numbers. Omitting the --mod operator will just report the target resource instead.
--limit supply a min or max separated by a comma. can write 'max' as the maximum to grab the max value of that resource. if you want to supply a max but no minimum, start with the comma, so --limit|,max
--silent disable chat whisper unless an error occurs. --silent will enable a once off flag, --silent|on and --silent|off will toggle the behaviour permanently
--pub publicly display resource set / display messages. Does not affect any other messages (like errors). Independent of --silent, so for example "!findres --sel --name|arrows --silent --pub" will still silence the whisper, but post the current arrows for that character to public chat.
example: !findres --char|sel --name|rage --mod|-1 --limit|0,max
would search the whole resource section for a label "rage" and reduce it by one, unless it's already at 0. If it's accidentally been set over its maximum value previously, it would now be reduced to the maximum value.
There's probably already something that does a similar job, but I was bored :)
I didn't test it too heavily.