I noticed most Vibes I've seen are in A442
Yes.
when I'm gigging with the band, - won't they more than likely be in A440 ?
Yes.
won't there be a difference ?
Yes.
I've seen you can "special" order some to be tuned in 440
Yes.
just looking for some input here
Yes.
Oops, sorry I got into a bit of a rut there.

For some reason, mallet instrument manufacturers have decided that A=442 is THE way to go for their "standard" tuning. I think it has to do with orchestras in Europe cranking up their basic starting pitch to A=442, and then having American colleges and universities (the buyers of most of the instruments produced by these manufacturers, at least in terms of the US market) jump on the 442 bandwagon.
Of course, for us gigging vibists, who deal with pianos tuned to A=440, synths tuned to A=440, and bassists and guitarists who still generally tune to A=440, that leaves us out in the cold: either special order A=440 bars (which can take six months), or ask the guitarists and bassists of the world to tune to 442 - which is fine, unless there's a pianist in the group.
Sometimes it's noticeable (unison lines with 440 piano and 442 vibes? Yeesh!), sometimes not (when is the last time a horn player on your gig was in tune?), but still, we're getting the short end of the stick from manufacturers. There's no reason why we should have to wait months longer to get a new instrument, or have to send the bars off to be retuned. It's absurd, and it vexes me to no end.
...and I've got to go teach now, so I'm going to stop writing, because (as you can guess) there is an even longer version of this rant waiting to travel from my fingers into the keyboard into the computer...