I think you have more than a few options here.
1) Use the current software you have for indexing.
Use different work offsets for each index, and add the index codes manually at the work offset.
This would cost you nothing and would be easy to implement.
2) What are you getting in the 4 axis package
4 Axis could include indexing, wrapping, rotary and true 4 axis tool paths. So the cost you received may be based on getting more options that you really don't need or want to pay for. So should be able to add indexing only or some version of just indexing for a lower cost than adding a full 4 axis package.
With that said their could be some real value to adding a full 4 axis package not matter what the cost it. It just depends on the work you do now and what you might want to do in the future.
3) Try to work it out with your VAR
Most systems will offer you an up front quote that may be more than you want to pay. There is margin in the deal when working with a reseller, if you let them know you may be taking your business else where it may motivate them to shave some dollars off the price.
4) I do not recommend switching CAM systems on the fly. There is more cost in learning a system and implementing one then there is in buying one. Who else does the change effect, posts, legacy files etc... Adding new software with new options can be really good thing, you just need to think the whole process out.
5) For BobCAD-CAM, Yes I work there, to add our 4 axis standard is about $999 and you get indexing wrapping and rotary tool paths.
