If all you can find are PVC fittings you can join ABS directly to PVC if you use "transition" cement. You could also use a Fernco fitting (a rubber collar that has clamps) or transition fittings like in the below link:
transition fittings You can see a Fernco fitting in the bottom of the photo. Available at many hardware stores and HD (at least here).
Fernco fittings These can be used to connect pipes of slightly different diameters and are also available as reducers for larger difference in pipe diameters.
Another thing you could try is going to a plumbing wholesaler.