There may be other sources for this bulb, but it may be less time and aggravation to just go to the dealer. Bring your credit card, because the cost will take your breathe away.

As for access, there have been reports here of individuals with extraordinary flexibility or chicken feet thin fingers to extract dash bulbs from underneath w/o removing the instrument cluster. I am in awe of such feats (no pun intended).

I installed an ambient temp guage on my V90 and had to remove the dash trim and instrument cluster. It is possible to access the cluster screws that hide under the trim by not having to remove all the wood/plastic trim (it will pop out with gentle pressure). Search in the picture gallery for Gregsky's diagram for cluster removal. This will help immeasurably.

IF you can afford it, I'd think about replace as many bulbs as you can either access or afford. You don't want to do this on a regular basis.
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John Shatzer, '97 V90 @ 115K