It depends on the model you're looking for. All resellers go to a different set of distributors or resellers, so they might be competitive on one manufacturer but not on another. Just today I found two of our distributors to be £100 apart on a bulb for the same projector.
By all means talk to us - I think we're pretty competitive - but if you want to look around then do a search in Google under the projector model. Many resellers put the bulb price alongside the projector price.