Yes, The cheapest and easiest place to do it is binswager(sp?) glass. If you need holes for a 3/4" bulkhead, I have the bits and I am willing to HELP YOU do it. Several other members have the needed bits as well. Some LFS will do it. Aquadome will but it is crazy expensive. Kingfish has the bits and is worth giving a call. BTW all these options come with zero guarantee. If the tank cracks it cracks. Don't be scared though. It makes aquarium maintenance easier.
Oh...River city does it too